Fiona Hill, a former top National Security Council expert on Russia, was testifying to Congress behind closed doors Monday, the latest former Trump administration official to be subpoenaed as part of the House impeachment inquiry into President Donald Trump.

Republican U.S. Rep. John Shimkus of Illinois says he no longer supports President Donald Trump after his “terrible and despicable” decision to pull American troops from Syria.

Two Florida businessmen tied to President Donald Trump’s lawyer and the Ukraine investigation were charged Thursday with federal campaign finance violations. 

Turkey launched its offensive Wednesday, with President Recep Tayyip Erdogan announcing on his official Twitter account that the operation had begun. President Trump defended his decision to pull back U.S. troops from northeastern Syria.

A conversation with U.S. Rep. Mike Quigley on President Trump’s moves to stall the impeachment inquiry.

The White House declared Tuesday it will halt any and all cooperation with what it termed the “illegitimate” impeachment probe by House Democrats, sharpening the constitutional clash between President Donald Trump and Congress.

 Facing unusually wide criticism, President Donald Trump sent out strong but conflicting signals on the “endless war” in Syria and Middle East on Monday. 

House Democrats are marching forward with their impeachment inquiry into President Donald Trump, with more depositions coming this week.

President Donald Trump said Friday the White House is preparing a letter to House Speaker Nancy Pelosi formally objecting to the Democrats’ impeachment inquiry without an official vote.

The handful of lawmakers who say they’re “troubled” or concerned by the allegations account for a small fraction of the 197 House Republicans. Still, their comments represent thin cracks in what has been a solid foundation for Trump.

President Donald Trump, ensnared in an impeachment inquiry over his request that Ukraine investigate former Vice President Joe Biden, on Thursday called on China to do the same.

U.S. Rep. Adam Schiff, chairman of the U.S. House Intelligence Committee, spent Thursday morning in Washington, D.C., as the impeachment inquiry of President Trump began in earnest. By Thursday evening, Schiff is set to be in the Chicago area.

Secretary of State Mike Pompeo acknowledged Wednesday he was on the July phone call between President Donald Trump and Ukraine’s president that's at the center of the House impeachment inquiry. 

Trading hot charges of intimidation, the Trump administration took a defiant step toward resisting Congress’ access to impeachment witnesses Tuesday, and House Democrats warned such efforts themselves could amount to an impeachable offense.

Democrats on Monday subpoenaed Rudy Giuliani, President Donald Trump’s personal lawyer who was at the heart of Trump’s efforts to get Ukraine to investigate political rival Joe Biden’s family.

The public has new insight on how President Trump interacts with world leaders behind closed doors. But do his actions amount to an impeachable offense? And how do allies and adversaries overseas view his dealings with Ukraine?