President Trump's White House wrapped up another whirlwind week, facing a mounting set of controversies surrounding investigations into possible collusion between the Trump campaign and Russia.

In the wake of FBI Director James Comey's abrupt firing earlier this month, reports have surfaced illustrating the fraught relationship between the top law enforcement official and the White House, including the allegation that Trump asked Comey in February to end his bureau's probe into former national security adviser Michael Flynn.

Compounding that was a Washington Post report on Friday revealing that a current White House official has been identified as a person of interest in the FBI's investigation of Russian election interference.

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Meanwhile, the Senate's investigation of the Trump campaign's ties to Russia appears to be accelerating, with Comey on Friday agreeing to testify before the panel. A date for the open hearing has not been set, but it is expected sometime after Memorial Day.

Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE (R-Fla.), who sits on the intelligence panel, will appear on CBS's "Face the Nation" and CNN's "State of the Union" on Sunday, where he's likely to face questions about areas of interest for that hearing.

Likewise, Rep. Adam Schiff Adam Bennett SchiffOvernight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings MORE (Calif.), the top Democrat on the House Intelligence Committee, will make an appearance Sunday on "State of Union." That appearance comes amid news reports that the panel's chairman, Rep. Devin Nunes (R-Calif.), has continued to view intelligence related to the Russia probe.

As controversies swirled in Washington, Trump embarked Friday for his first overseas trip as president – a nine-day excursion across five countries in the Middle East and Europe.

Secretary of State Rex Tillerson, who is currently in Saudi Arabia with Trump, is set to appear on "Fox News Sunday" to talk about the president's first days abroad and what the Trump administration is hoping to accomplish on the trip.

Here's the full lineup:

ABC’s “This Week”: White House national security adviser H.R. McMaster will be on the show, as will the top lawmakers on the House Oversight Committee – Chairman Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (R-Utah) and ranking member Rep. Elijah Cummings (D-Md.). Sen. Ben Sasse (R-Neb.) will also make an appearance.

CBS’s “Face the Nation”: Sen. Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (Calif.), the top Democrat on the Senate Judiciary Committee, is set to appear. And Sen. Marco Rubio (R-Fla.), a member of the Senate Intelligence Committee, will also be on.

“Fox News Sunday”: Secretary of State Rex Tillerson will join the show from Riyadh. Sen. John McCain John Sidney McCainThe electoral reality that the media ignores Kelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks MORE (R-Ariz.) will make an appearance.

CNN’s “State of the Union”: Rubio is set to appear. Rep. Adam Schiff (Calif.), the top Democrat on the House Intelligence Committee, will also be on the show, as will Rep. Adam Kinzinger (R-Ill.).