Bolton's already been active with his PACs:
John Bolton returns to PACs and endorses 5 incumbents
Rachel Wolf
Former Assistant to the President for National Security Affairs, Ambassador John R. Bolton, was fired last Tuesday, and has already re-entered the political arena. Bolton returned to overseeing his political action committees (PACs), John Bolton PAC and the John Bolton Super PAC.
The John Bolton PAC announced on its website its endorsements of Sen. Tom Cotton of Arkansas, Sen. Cory Gardner of Colorado, Sen. Thom Tillis of North Carolina, Rep. Adam Kinzinger (IL-16), and Rep. Lee Zeldin (NY-01) and that it will contribute $10,000 to each candidate's primary and general election campaigns, for a total of $50,000 of campaign contributions.
"The experience that these incumbent members of Congress have provides them with a remarkable understanding and knowledge of the threats we face from international terrorism and rogue regimes such as Iran and North Korea," Bolton said in a statement on John Bolton PAC's website.
Read more at: https://www.jpost.com/American-Politics/John-Bolton-returns-to-PACs-and-endorses-5-incumbents-601807
I read another article where it said these candidates might debate whether they should accept this money since, now, Bolton is on the outs with Trump. Could it have an adverse affect? I can find that article if anyone doubts this.
All of those above are running for reelection in 2020, hence, the contributions.