Donald Trump is not impressed. Former House majority leader Eric Cantor formally endorsed Jeb Bush for president on Thursday, notifying the world of his decision on Twitter. The show of support by Cantor, who has been a vocal critic of Trump’s over the past couple of months, was, yet again, too much for Trump to let slide without commentary, and he took to the microblogging site within hours to question the impact of the endorsement. Cantor lost his 2014 reelection bid in a primary contest with Republican Dave Brat.

Read More: Jeb Bush Lands Eric Cantor Endorsement and Mockery From Donald Trump – Bloomberg Politics