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(COMBO) This combination of pictures created on January 8, 2018 shows files photos of FBI Director Robert Mueller (L) on June 19, 2013, in Washington, DC; and US President Donald Trump on December 15, 2017, in Washington, DC.

Trump on march 18, 2018, intensified his attacks on Mueller's Russia investigation as biased against him, but stopped short of targeting the special counsel -- whose ouster lawmakers warned would cross a "massive red line." In an early-morning flurry on Twitter, Trump insisted that Mueller's team of investigators is staffed with "hardened" Democrats biased against him.
/ AFP PHOTO / SAUL LOEB AND Brendan SmialowskiSAUL LOEB,BRENDAN SMIALOWSKI/AFP/Getty Images

Mueller protection amendment doesn't have part criticized by Democrats

Richard Grenell, nominee to be US ambassador to Germany, testifies during a Senate Foreign Relations Committee hearing on Capitol Hill in Washington, DC, September 27, 2017. (SAUL LOEB/AFP/Getty Images)

Confirmation for Trump's nominee for ambassador to Germany is held up

WASHINGTON, DC - NOVEMBER 01: Rep. James Bridenstine (R-OK) testifies before the Senate Commerce, Science and Transportation Committee during his confirmation hearing to be administrator of the National Aeronautics and Space Administration (NASA) in the Russell Senate Office Building on Capitol Hill November 1, 2017 in Washington, DC. Democratic members of the committee expressed reservations about Bridenstine's qualifications to head NASA, including his political career and lack of science credentials. (Photo by Chip Somodevilla/Getty Images)

Trump's NASA nominee is confirmed after Senate drama

Secretary of State-designate Mike Pompeo listens during his confirmation hearing with the Senate Foreign Relations Committee, Thursday, April 12, 2018 on Capitol Hill in Washington. (AP Photo/Jacquelyn Martin)

Pompeo confirmation winnowing down to a handful of undecided Democrats

WASHINGTON, DC - NOVEMBER 01: Rep. James Bridenstine (R-OK) testifies before the Senate Commerce, Science and Transportation Committee during his confirmation hearing to be administrator of the National Aeronautics and Space Administration (NASA) in the Russell Senate Office Building on Capitol Hill November 1, 2017 in Washington, DC. Democratic members of the committee expressed reservations about Bridenstine's qualifications to head NASA, including his political career and lack of science credentials. (Photo by Chip Somodevilla/Getty Images)

After failure to launch, Republican senator switches vote to save Trump's NASA nominee

FILE - In this Saturday, April 14, 2018 file photo, a Syrian soldier films the damage of the Syrian Scientific Research Center which was attacked by U.S., British and French military strikes to punish President Bashar Assad for suspected chemical attack against civilians, in Barzeh, near Damascus, Syria. (AP Photo/Hassan Ammar, File)

Senators leave classified briefing on Trump's Syria policy 'very unnerved'

NEWARK, NJ - NOVEMBER 14: Sen. Robert 'Bob' Menendez (D-NJ) arrives federal court, November 14, 2017 in Newark, New Jersey. The jury continues to deliberate in his corruption trial. (Drew Angerer/Getty Images)

Top Committee Democrats announce opposition to secretary of state nominee Mike Pompeo

Physician to the President U.S. Navy Rear Admiral Ronny Jackson meets with Sen. Jon Tester (D-MT) in his office in the Hart Senate Office Building on Capitol Hill April 17, 2018 in Washington, DC. (Mark Wilson/Getty Images)

Trump's pick to lead Veterans Affairs courts a skeptical Senate

US Senator John McCain will miss the vote on the tax overhaul bill in the US Senate

McCain undergoes surgery for intestinal infection

WASHINGTON, DC - OCTOBER 24: Sen. Bob Corker (R-TN) speaks to members of the press on Capitol Hill about U.S. President Donald Trump October 24, 2017 in Washington, DC.

New war authorization from Congress unveiled following Syria strikes

Andrew Wheeler during his confirmation hearing to be Deputy Administrator of the Environmental Protection Agency before the United States Senate Committee on the Environment and Public Works on Capitol Hill in Washington, D.C. on November 8th, 2017. Credit: Alex Edelman / CNP - NO WIRE SERVICE - Photo by: Alex Edelman/picture-alliance/dpa/AP Images

Former Inhofe aide Wheeler confirmed as EPA's No. 2

Senators introduce bipartisan legislation protecting Mueller

WASHINGTON, DC - DECEMBER 01: U.S. Sen. Bob Corker (R-TN) speaks to members of the media at the Capitol December 1, 2017 in Washington, DC. Senate GOPs indicate that they have enough votes to pass the tax reform bill. (Photo by Alex Wong/Getty Images)

Capitol Hill defense hawks push Trump to strike Syria soon

$WASHINGTON, DC - NOVEMBER 14: Sen. Bob Corker (R-TN), Chairman of the Senate Foreign Relations Committee listens to testimony during a committee hearing November 14, 2017 in Washington, DC. The committee heard testimony on the "Authority to Order the Use of Nuclear Weapons." (\Win McNamee/Getty Images)$

Senators disagree over military response to Syria -- and Trump's legal authority to wage it

Former Hawaii Sen. Daniel Akaka dies at 93

WASHINGTON, DC - FEBRUARY 07: U.S. Senate Majority Leader Sen. Mitch McConnell (R-KY) walks towards the Senate chamber at the Capitol February 7, 2018 in Washington, DC. (Alex Wong/Getty Images)

Congress unveils $1.3 trillion spending package, includes background check bill

It's business as usual -- for the most part -- on Capitol Hill, despite snow

The US Capitol dome and it's reflection are seen on Capitol Hill in Washington, DC on December 29, 2012. As the fiscal cliff deadline looms, Congress and the White House have still not reached a compromise. If no deal is struck by December 31 at midnight, taxes will automatically go up on both high earners and the middle class, and across-the-board spending cuts will go into effect. AFP PHOTO/Karen BLEIER (Photo credit should read KAREN BLEIER/AFP/Getty Images)

Senators block Yemen war powers resolution

WASHINGTON, DC - MAY 08: Senate Judicary Committee member Sen. John Cornyn (R-TX) listens to witnesses during a subcommittee hearing on Russian interference in the 2016 election in the Hart Senate Office Building on Capitol Hill May 8, 2017 in Washington, DC. Former acting Attorney General Sally Yates testified to the subcommittee that she had warned the White House about contacts between former National Security Advisor Michael Flynn and Russia that might make him vulnerable to blackmail. (Photo by Chip Somodevilla/Getty Images)

Republicans say Congress doesn't need to pass law protecting Mueller

WASHINGTON, DC - JANUARY 22 : Senate Majority Leader Mitch McConnell (R-KY) arrives and walks to his office on Capitol Hill, January 22, 2018 in Washington, DC. Lawmakers are continuing to seek a deal to end the government shutdown, now in day three. (Photo by Drew Angerer/Getty Images)

Why McConnell hasn't said anything on Trump's Mueller attacks

LOUISVILLE, KY - FEBRUARY 12: U.S. Senate Majority Leader Mitch McConnell (right) (R-KY) and U.S. Senate Democratic Leader Chuck Schumer (D-NY) shake hands after Shumer delivered a speech and answered questions at the University of Louisville's McConnell Center February 12, 2018 in Louisville, Kentucky. Sen. Schumer spoke at the event as part of the Center's Distinguished Speaker Series, and Sen. McConnell introduced him. (Bill Pugliano/Getty Images)

The race to fund the government is on (again)

US Republican Senator from Ohio Rob Portman leaves the room as acting US Trade Representative Demetrios Marantis testifies before the Senate Finance Committee on the President's 2013 Trade Agenda on Capitol Hill in Washington on March 19, 2013.

Capitol Hill's stacked to-do list before leaving town: Averting a government shutdown, war powers debate

GOP senator says he will oppose Pompeo and Haspel, complicating their paths to confirmation

WASHINGTON - NOVEMBER 06: The early morning sun strikes the U.S. Capitol November 6, 2006 in Washington, DC. Midterm elections take place November 7, potentially changing the balance of power in the nation's capital. (Photo by Win McNamee/Getty Images)

GOP leaders want to put off Yemen war powers vote

About

Ted Barrett is a senior congressional producer for CNN Politics.