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Bolton visits the White House in October. Photo: Chip Somodevilla / Getty Images

John Bolton will be in the mix this year. The hawkish former UN ambassador — whose name I often hear mentioned when sources game out the next phase of Trump's national security team — launches on Thursday what he says will be a $1 million advertising campaign to support Kevin Nicholson in the Republican Senate primary in Wisconsin.

Why this matters: Bolton remains an influential, if controversial, voice in Republican foreign policy, advocating a tear-it-up position with the Iran nuclear deal and muscular military actions around the world.

  • This is the first time Bolton has weighed into a Republican primary, and if history's any guide he'll have a lot of money to play with this cycle.
  • Through the past two campaign cycles he's raised and spent more than $20 million through his various groups, including his super-PAC. Bolton told me his goal is to raise and spend $25 million in the 2018 midterms.

Why Nicholson? Bolton tells me he's impressed by Nicholson's credentials — a former Marine who was once a high-profile college Democrat but became a Republican after his time in the service.

  • He said he looks for two things in the candidates he supports: First that they share Bolton's view of "America's place in the world" and second that they have the potential to be an "opinion leader" when they arrive in Washington.
  • The hawkish senator Tom Cotton — who Bolton supported and has become a major force in D.C. and could one day be Trump's CIA director — is a good example of what Bolton is searching for.
  • Bolton says he expects to endorse and financially support as many as 90 candidates for Congress this cycle. I'm told that the last two cycles, he gave to more than 70 and 80 candidates, respectively.

Go deeper

CNN: Pentagon watchdog says Ronny Jackson drank on duty and harassed staff

Rep. Ronny Jackson walking through the Canon Tunnel to the U.S. Capitol in January. Photo: Stefani Reynolds/Getty Images

Rep. Ronny Jackson (R-Texas) allegedly made "sexual and denigrating" comments about a female staffer, drank alcohol and took sleeping medication while working as White House physician, according to an official report obtained by CNN Tuesday night.

Driving the news: The Department of Defense inspector general's report stems from a years-long investigation. Jackson has called the allegations "false and fabricated."

DOJ pressed to enforce Al Jazeera foreign agent ruling

Illustration: Aïda Amer/Axios

The Justice Department is being pressed to enforce its own demand that the U.S. arm of Qatari broadcaster Al Jazeera register as a foreign agent.

Why it matters: The launch of Al Jazeera's new right-of-center U.S. media venture, Rightly, has refocused attention on the media company's alleged links to Doha, and DOJ's efforts to crack down on media outlets viewed as foreign interest mouthpieces.

Poll: Immigration is America's most-polarizing issue

Data: The American Aspirations Index/Populace; Chart: Will Chase/Axios

Immigration was found to be the most polarizing issue in America based on new polling from Populace.

Why it matters: Americans have surprisingly similar priorities for the U.S., but immigration stands out as one of the few issues with clear partisan differences. It underscores the challenge for advocates and lawmakers hoping to pass immigration reform in the coming weeks amid narrow margins in Congress.