Now, they’re not entirely blind to the damage Mr. Trump is doing to the Republican brand. Democrats are energized, and though Mr. Trump’s base is holding, “soft” Trump voters are slowly sinking his approval numbers. One friend who twice voted for Barack Obama now sees World War III on the horizon and deeply regrets his vote for Mr. Trump.

President Trump has been in office only about six months and yet is already under investigation by congressional committees and the special counsel, Mr. Mueller. This fact alone should make every Republican nervous.

The country needs to see these investigations through. Regardless, my conservative friends should ask themselves, what has President Trump accomplished that a President Mike Pence couldn’t have, without all of the drama? And what matters more: President Trump or their conservative values? Here, I believe it’s the latter. Mr. Trump, after all, was runner-up to Ted Cruz in the Iowa caucuses.

I see only one thing that might give my conservative friends pause about turning against Mr. Trump — Fox News. After all, it helped create him. Most people here watch Fox News, and have for a generation.

Fox News is always on the TV in diners and other restaurants. In bars, if there isn’t a game on, Fox News is there. If there are a couple of televisions or more, one will most likely be tuned to Fox. And it’s not only TV. It’s radio. Our big “blow torch” conservative radio station out of Des Moines blasts conservative indignation and self-righteousness for hours a day and serves up Sean Hannity for hours every night.

I once grumbled to a friend that I didn’t think Fox was “Fair and Balanced” at all. He started to argue with me, then thought better of it, saying, “But at least they try — no one else does.”

To me, only that network has the power to convince conservatives that, if one or more of the investigations raises the question of impeachment, it’s in the best interest of the party and the conservative agenda to dump Mr. Trump.