Former South Carolina Rep. Mark Sanford is seriously considering challenging President Donald Trump in the primary, even though he called the idea “preposterous” on many levels. It’s a rare moment when you should take a politician at his word.

Even if you look past the huge hurdles of the president’s popularity among the Republican base and the humongous fundraising advantage, the anti-Trump movement is simply running out of time, and it’s arguably too late to mount a serious presidential campaign at all.

If Sanford, former Illinois Rep. Joe Walsh, former White House Communications Director Anthony Scaramucci, former Arizona Sen. Jeff Flake, former Ohio Gov. John Kasich and others want to talk about maybe potentially mounting a campaign, they should explain to donors how this Trump takedown is actually going to take place.

First of all, the president’s job approval rating among Republicans is extremely high. It was 90 percent in a mid-July poll by NPR/PBS NewsHour/Marist and 88 percent in an Aug. 11-13 FOX News poll.