Diplomats to testify over Trump-Ukraine efforts
They have requested documents by October 15.
"The committees are investigating the extent to which President Trump jeopardized US national security by pressing Ukraine to interfere with our 2020 election and by withholding military assistance provided by Congress to help Ukraine counter Russian aggression, as well as any efforts to cover up these matters", Reps.
But Democrats have filed a subpoena demanding to see relevant White House records.
Johnson's account of Sondland's assertion - that Trump wanted the probes as a condition of releasing the aid - appears to contradict what Sondland told another diplomat roughly one week later.
The subpoenas come as a new whistleblower stepped forward with what the person's lawyer said was firsthand knowledge of key events.
Energy Secretary Rick Perry on Monday contradicted news reports of his impending resignation from last week, and disputed new reports of his involvement in Trump administration activities with Ukrainian government officials at the heart of the impeachment inquiry into President Donald Trump.
However, Mr Zaid said the person had first-hand knowledge of allegations associated with the phone call Mr Trump made with Ukrainian President Volodymyr Zelensky on 25 July.
"There's a lot of talk about Biden's son, that Biden stopped the prosecution and a lot of people want to find out about that so whatever you can do with the Attorney-General would be great", Mr Trump said in the call with President Volodymyr Zelenskiy, according to the summary provided by the US Justice Department.
"And by the way, I would LOVE running against 1% Joe Biden - I just don't think it's going to happen".
He also said that "Ukraine must not be embroiled in scandals connected with the presidential election". Two Giuliani associates and a former USA ambassador to Ukraine - removed by Trump in the spring reportedly at Giuliani's behest - are slated to testify this week too.
Booker would not say if he would vote to remove Trump from office if an impeachment vote moved forward to the Senate. "You'll have to figure that out for yourself", Mr Trump said.
Perry's comments largely echo the Energy Department's statement on Sunday, which stated that Perry "absolutely supported and encouraged the President to speak to the new President of Ukraine to discuss matters related to their energy security and economic development".
Failure to comply "shall constitute evidence of obstruction of the House's impeachment inquiry". The call shows Trump asking Zelenskiy to look into alleged corruption in Ukraine by Biden and his son Hunter, setting off a Democratic-led House impeachment inquiry into Trump. Graham spoke on Fox News Channel's "Sunday Morning Futures".