The second-term Maryland governor has been implicitly going after Trump in speeches, meeting with Never Trump Republicans, and planning a March trip to Iowa as vice chair of the National Governors Association.

It’s all fueling speculation that Hogan, a 62-year-old cancer survivor who coasted to reelection in liberal Maryland and remains one of the most popular governors in the country, is open to the prospect of a long-shot primary challenge to the incumbent president. His flirtation comes at a time when Trump is facing increasing blowback over his handling of the protracted government shutdown and bracing for a potentially devastating report by special counsel Robert Mueller.

Hogan used his inaugural address on Wednesday to repudiate the “debilitating politics” of Washington — and to raise the specter of impeachment. He recalled how his father, former Rep. Lawrence Hogan, was the first Republican congressman to support the removal of Richard Nixon.