In a March letter, Obama's office described the investigation into Joe Biden's ties to Ukraine as an effort to “shift the blame" for Russia's 2016 election meddling.
Greenpeace Russia warned Monday that the fires, which have been burning for more than a week, could disperse atoms that emit radiation.
Rep. Adam Schiff slams the "dead of night" decision to gut the intelligence community's independence by firing Michael Atkinson.
President Donald Trump has fired Michael Atkinson, the inspector general for the intelligence community.
"I mean, the message seems pretty clear, if you criticize the president, then you are going to get attacked," said Sen. Chris Murphy (D-Conn.)
The Utah senator previously said investigating Joe Biden and his son Hunter seemed politically motivated.
Romney has the power to block an upcoming subpoena in the Senate investigation of the former vice president's son.
Elaine McCusker raised concerns about Trump withholding aid from Ukraine, which was at the center of his impeachment trial.
Engaging in a plan to hold up congressionally approved funds to advance a partisan political agenda is illegal, CREW said in a statement.
John Rood resigned at the president's request, becoming the latest official to be purged following the impeachment trial.