Democrats currently hold 188 of 435 seats in the House of Representatives and 46 of 100 seats in the Senate.

The number of votes required to impeach and convict a President is 218 in the House (to impeach) and 67 in the Senate (to convict).

I think we can safely assume that 100% of those Democrats would vote to impeach and convict Donald Trump, so how many Republicans would need to jump ship to get rid of him?

40 House members and 21 Senators. Not impossible numbers by any means.

Trump just needs to commit an undeniably impeachable offense. He will do so. It's a matter of when, not if.

Assuming he doesn't resign first