The former president went after all three network TV late-night hosts.
The prime minister will tell the Labour conference that he will "build a new Britain".
His comments come amid scrutiny that a second Trump term may mean for more US lenience for Russia in the Ukraine war.
Prosecutors urged a judge to keep Ryan Wesley Routh detained ahead of trial, citing the letter.
The chancellor defended her decision to give public sector workers a pay rise while cutting winter fuel payments for pensioners.
The party leaders are expected to move the debate over cutting the winter fuel payments.
"We are still selling arms to Israel. I thought we voted for change, Rachel."