They say the bill endangers $450 million a year in transit funding for this area.
They are especially concerned the 20 percent of the federal gas tax that currently goes to mass transit would be eliminated.
The congressmen want to make sure tax incentives continue for people who take mass transit.
"Certainly, if we take a look at what's going on here for Chicago, how many riders are on the CTA, on Metra, on Pace, these are absolutely critical programs for regions like Chicago," said Republican Rep. Robert Dold.
Many Republicans believe the bill as currently proposed is more financially responsible.