Civil rights activist Danielle Muscato’s tweets went viral over the weekend after she blasted President-elect Donald Trump for “embarrassing” himself on Twitter instead of preparing to govern.

In the weeks after winning the 2016 presidential election, Trump has been criticized for refusing to tone down his presence the social media platform. He has attacked journalists and claimed that millions voted illegally.

Muscato apparently had enough on Saturday after Trump whined about Alec Baldwin’s portrayal of him on Saturday Night Live. By Sunday, her tweets had been shared thousands of times.

Jesus fucking Christ, @realDonaldTrump. You are the president-elect. Pick your fucking battles, man. You're embarrassing yourself. — Danielle Muscato (@DanielleMuscato) December 4, 2016

When @realDonaldTrump "lies," acknowledge and call out as propaganda! When he tests boundaries, acknowledge and call out as fascism! #RESIST — Danielle Muscato (@DanielleMuscato) December 4, 2016

We CANNOT "wait and see." @realDonaldTrump is telling us, here and now, what he is going to do. BELIEVE HIM. — Danielle Muscato (@DanielleMuscato) December 4, 2016

"Millions" of "illegal" votes is not a claim about reality, despite @realDonaldTrump's pretense. It is a warning; a threat. Pay attn—RESIST! — Danielle Muscato (@DanielleMuscato) December 4, 2016