To put this in further context of Representatives crossing party lines:
-Bill Clinton Impeachment (1998): 5 Democrats voted for; 5 Republicans voted against
-Trump's 1st Impeachment (2019): 0 Republicans voted for (ZERO)
-Trump's 2nd Impeachment (2021): 10 Republicans voted for (TEN)
So Trump holds at least three records:
1) First President Impeached twice
2) First President to have ten members of his own party vote for impeachment, more than twice the previous record
3) First President to have a vote cast to convict in the Senate by a member of his own party, Mitt Romney