WASHINGTON— The head of the Federal Election Commission reminded candidates that asking for help from foreign governments is illegal in an apparent subtweet of President Donald Trump

Ellen Weintraub's tweet came after Trump exclaimed that China should investigate former vice president Joe Biden, despite already being in the middle of an impeachment inquiry after asking Ukraine for the same thing.

"By the way, likewise, China should start an investigation into the Biden's because what happened in China is just about as bad as what happened with Ukraine," Trump told reporters on the White House South Lawn Thursday.

“Is this thing on?” Ellen Weintraub wrote soon after Trump's press gaggle, re-upping her original scathing memorandum from June, accompanied with the microphone emoji.

"Let me make something 100% clear to the American public or anyone running for public office,” Weintraub originally wrote. “It is illegal to solicit, accept, or receive anything of value from a foreign national in connection with a U.S. election."

She prefaced her original statement on Twitter by writing, "I would not have thought that I needed to say this," after Trump told ABC News in June that he may not alert the FBI if a foreign government offered dirt on a 2020 political rival.

"Anyone who solicits or accepts foreign assistance risks being on the wrong end of a federal investigation," Weintraub originally said. "Any political campaign that receives an offer of a prohibited donation from a foreign source should report that offer to the Federal Bureau of Investigation."

Americans by a 45%-38% plurality now support a vote by the House of Representatives to impeach President Donald Trump, a USA TODAY/Ipsos Poll finds, as allegations continue to swirl around the embattled White House.

Contributing: Susan Page, Courtney Subramanian, David Jackson and John Fritze.