President Trump's lawyers have begun defending him at his impeachment trial, accusing Democrats of seeking to overturn the result of the 2016 election.
"The president did absolutely nothing wrong," White House Counsel Pat Cipollone said.
Mr Trump's defence will last three days and follows the Democrats' prosecution case which ended on Friday.
The president faces two charges linked to his dealings with Ukraine.
The charges, or articles of impeachment, accuse him of abuse of power and obstruction of Congress.
He is alleged to have withheld military aid to pressure the Ukrainian President, Volodymyr Zelensky, into starting a corruption investigation into Mr Trump's political rival, Democrat Joe Biden, and his son Hunter.
The trial in the Senate will decide if Mr Trump should be removed from office. This is unlikely as the Republicans control the Senate and any such move would need a two-thirds majority.
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