Trump won't cooperate with impeachment inquiry: White House
The Trump White House has refused to cooperate with Congress's impeachment inquiry, arguing that it is "highly partisan and unconstitutional".
The House of Representatives has begun issuing subpoenas for White House documents and has scheduled hearings for various staffers in connection with the president's call with Ukraine's leader.
In the call, Mr Trump pushed Ukraine President Volodymyr Zelensky to investigate former Vice President Joe Biden and his son Hunter.
In a letter sent to Speaker Nancy Pelosi and the three chairmen investigating the president, counsel Pat Cipollone said the House is taking the American people down a "dangerous path".
"Put simply, you seek to overturn the results of the 2016 election and deprive the American people of the President they have freely chosen," the letter states.
"Many Democrats now apparently view impeachment not only as a means to undo the democratic results of the last election, but as a strategy to influence the next election, which is barely more than a year away."
Mr Cipollone also said it was unprecedented for a formal impeachment inquiry to be launched without a vote authorising it.
A majority of House members have already voted support for an impeachment inquiry, including a handful of Republicans.
Mr Cipollone also said the inquiry "violates fundamental fairness and constitutionally mandated due process".
"You have denied the President the right to cross-examine witnesses, to call witnesses, to receive transcripts of testimony, to have access to evidence, to have counsel present, and many other basic rights guaranteed to all Americans."
Intelligence Committee Chairman Adam Schiff responded with a four-sentence tweet.
"The White House says there is nothing wrong with pressuring a foreign country to intervene in a US election," he said.
"They say they will not cooperate with an impeachment inquiry unless it's on their terms.
"They mean the President is above the law.
"The constitution says otherwise."
Earlier today the State Department blocked Ambassador Gordon Sondland from testifying in Congress.
Impeachment is considered the only way to prosecute a sitting president for federal crimes committed.
If Mr Trump is removed from office via impeachment, he could face criminal charges and possible jail time if found guilty.