Multiple sources on Twitter claim Media Matters founder and Democrat political operative David Brock suffered a heart attack Tuesday morning.

Statement from former Media Matters head: "David Brock suffered a heart attack while working in the Washington DC office early Tues…" — Maggie Haberman (@maggieNYT) March 22, 2017

Dem super-operative David Brock had a heart attack ystdy, went to hospital, "looking forward to a swift recovery," per spox. — Alex Seitz-Wald (@aseitzwald) March 22, 2017

A spokesperson for Media Matters claimed Brock, 54, is recovering.

David Brock, longtime Clinton adviser, super PAC guy & MMFA founder, suffered heart attack yesterday, spox says. Hoping for "swift recovery" — Dylan Byers (@DylanByers) March 22, 2017

The conservative turned liberal is perhaps best known as being a hatchet man for the Clintons. The Media Matters for America organization targeted Trump supporters during the 2016 election, routinely churns out conservative hit pieces, and recently announced it would work alongside Facebook to censor “fake news.”

The Emergency Election Sale is now live! Get 30% to 60% off our most popular products today!