US President Donald Trump has lambasted Mitt Romney for supporting his impeachment.
Trump was on Wednesday acquitted by the US Senate.
Romney, who ran for president against Barack Obama, was the only Republican Senator who voted against Trump.
The impeachment vote result was 52-48 vote.
Romney made history as the only Republican ever to vote against a president of the same party.
Trump tweeted: “Had failed presidential candidate MittRomney devoted the same energy and anger to defeating a faltering Barack Obama as he sanctimoniously does to me, he could have won the election”.