Former National Security Adviser John Bolton reportedly instructed one of his advisers to alert a National Security Council lawyer following Trump’s Ukraine call.

Some have suggested that Bolton is behind the Ukraine whistleblower scandal and this new evidence could help prove those claims.

According to Fox News:

Fiona Hill, the former senior director for Russian and Eurasian affairs, told lawmakers on Monday that a July meeting with Ukrainian and U.S. officials about unspecified investigations left her and John Bolton, the former national security adviser, so concerned that he directed her to alert a lawyer in the National Security Council, Fox News confirmed.

Hill, who exited the administration days before the July 25 phone call between President Trump and Ukraine’s Volodymyr Zelensky, testified on Monday for about nine hours in front of three House panels where she reportedly raised concerns about a July 10 meeting. The Wall Street Journal reported that those at the hearing took her comments to refer to the “investigation that could implicate Biden and his son.”

Both Bolton and Hill, who were present at the meeting, had concerns about the conversation, she testified. Bolton directed her to alert John Eisenberg, a lawyer at the NSC, she said, the Journal reported.

The New York Times reported that during the meeting, Bolton got into a heated exchange with Gordon D. Sondland, the European Union ambassador. The paper reported that Sondland worked with Rudy Giuliani, Trump’s personal lawyer, to pressure the Ukrainians to investigate the Democratic presidential candidate Joe Biden. Hill reportedly said Bolton likened the former New York City mayor to a “hand grenade who’s going to blow everybody up.” She said it appeared Giuliani was not working in coordination with the normal foreign policy channels when dealing with Ukraine.

Bolton reportedly instructed his adviser to alert the lawyer that Giuliani was working with Chief of Staff Mick Mulvaney on a rogue investigation.