Sen. Jeff Flake said this week that President Donald Trump is “inviting” a Republican primary challenger in 2020. The Arizona Republican said Trump’s actions will determine whether he gets a primary challenger in the next election. “I think that certainly depends on him,” Flake said on Georgia Public Broadcasting. “I think he could govern in a way that he wouldn't. But, I think that the way that—the direction he's headed right now, just kinda drilling down on the base rather than trying to expand the base—I think he’s inviting one.” Trump has taunted Flake as “weak” and “toxic,” and could endorse one of Flake’s primary challengers. Flake has been consistently critical of Trump and of his GOP colleagues who don’t directly call out the president.