"Interesting to compare this to their arguments on transitioning teenagers," Spectator contributing editor Stephen L. Miller wrote on X.
"This is monumentally insulting to the millions of Americans that voted for a change last November," Rep. Derrick Van Orden, R-Wis., said on X.
Slotkin, who was elected to the Senate as a Democrat in a state Trump won by 1.4 percentage points, delivered the party's rebuttal to the president's joint address to Congress last week.
In a Sunday interview with "Meet the Press," Slotkin said that the Democrats' loss of confidence following Trump's November victory isn't "something hidden."