A bipartisan push to bolster railroad safety is turning into a slog as top Senate Republicans indicate they are not yet on board with the main legislative response to the East Palestine, Ohio, train derailment.

Ohio Sens. J.D. Vance (R) and Sherrod Brown (D) unveiled a rail safety proposal last week that has already won over the White House and top Democrats. But winning support from Republicans is proving to be harder as some question if it is too soon to move on a bill that could have unintended consequences. 

“We’ll take a look at what’s being proposed, but an immediate quick response heavy on regulation needs to be thoughtful and targeted,” Sen. John Thune (S.D.), the No. 2 Senate Republican, told The Hill. 

“Let’s define the problem. Let’s figure out what the solutions are and if there are things we need to fix, we’ll fix them,” Thune continued.

Vance and Brown’s Railway Safety Act would boost safety requirements for trains carrying […]