The Republican was in need of new attorneys following the departure of all five members of his defence team last week.

Lawyers David Schoen and Bruce Castor, both experienced in criminal defence, will now head the new defence team in the trial set to begin in the US Senate on February 9, Trump’s office said in a statement.

In a statement, Trump’s office says: “Notably, Schoen has already been working with the 45th President and other advisors to prepare for the upcoming trial, and both Schoen and Castor agree that this impeachment is unconstitutional – a fact 45 Senators voted in agreement with last week.”

Both attorneys issued statements through Trump’s office saying they were honoured to take the job.

Castor said in the statement, “I consider it a privilege to represent the 45th President. The strength of our Constitution is about to be tested like never before in our history. It is strong and resilient. A document written for the ages, and it will triumph over partisanship yet again, and always.”

Schoen had already been working with the defence team, and he and Castor “agree that this impeachment is unconstitutional”, the statement said.

Trump, who left office on January 20, faces trial on a charge that he incited the mob that stormed the US Capitol building during the certification of President Joe Biden.