When Tennessee Sen. Bob Corker asked President Donald Trump to campaign for Alabama Sen. Luther Strange ahead of next week’s Senate Republican runoff, he might have had a little self-preservation in mind.

A win by Roy Moore, the controversial former Alabama Supreme Court chief justice, would throw a wrench into the deliberative body in which the moderate Tennessee Republican serves. But a Moore victory could also embolden primary challengers to other sitting senators, like Corker.

Corker said Tuesday he hasn’t yet reached a decision about seeking a third term, and he wouldn’t comment on reports that Trump asked him to run for re-election at their meeting last week.

He’s already facing at least one declared primary challenger. Tennessee is familiar with contentious primaries, especially in open-seat races. But should he run again, Corker can find solace in the fact that there are at least two more Republicans interested in taking him on, which would split the anti-incumbent vote.

In today’s environment, “you can make anyone look like a squish,” one GOP operative said of Corker. “And sure, you can make that argument, but if the president comes in and says, ‘Corker’s my buddy,’ it would be hard to beat him.”