Michele Kelemen

U.S. presidents have a long history of rewarding wealthy political donors with ambassadorships. Many appointees ably take on the work of diplomacy. Some others cause controversy.

The Trump administration on Monday labeled four more Chinese news organizations as "foreign missions," expanding its restrictions on what it calls Chinese propaganda outlets in a move that's likely to anger Beijing.

Updated at 5:36 p.m. ET

President Trump is ousting State Department Inspector General Steve Linick, extending a string of administration firings of government watchdogs.

The president sent notice of Linick's removal, effective in 30 days, to House Speaker Nancy Pelosi on Friday. A State Department spokesperson offered no reason for the change but issued a statement confirming that Linick will be replaced by Ambassador Stephen Akard, who currently directs the department's Office of Foreign Missions.

When the U.S. ambassador to Ukraine was abruptly removed from her post this year, some Democratic lawmakers called it "a political hit job." Now the congressman in charge of the impeachment inquiry into President Trump is making the case that Marie Yovanovitch's ouster is part of the story of a president abusing his power in relations with Ukraine.

Yovanovitch will be the sole witness Friday, the second day of the inquiry's public hearings over whether Trump used military aid as leverage to pressure Ukraine into investigations that would benefit him politically.

On paper, Kurt Volker's job in the Trump administration was to support Ukraine and help end a war started by Russia in the east of the former Soviet Republic. Volker is now caught up in a political battle at home over President Trump's efforts to get Ukraine to dig up dirt on former Vice President Joe Biden and his son Hunter.

Volker will be deposed Thursday behind closed doors as part of the House of Representatives' impeachment inquiry into President Trump.