Talk-radio host Rush Limbaugh on Tuesday said Democratic Rep. Jerry Nadler’s letter to 81 Trump associates seeking dirt on the president is helping set the stage for impeachment after Trump is re-elected in 2020.Only then, he suggests, will the left be confident enough, or brazen enough, to try for impeachment.“The Democrats expect Trump to be re-elected. And look, after that CPAC speech Saturday, everybody knows he’s gonna be re-elected. A couple more of those, and it’s over,” he said. “But the Democrats are telling us they think that he’s gonna be re-elected. That’s what Nadler’s doing. This witch hunt. I’ll explain this to you.”Limbaugh said the Democrats and media, working together, have been unable to push the president’s approval numbers down into the 20s, which would make impeachment feasible.