Sen. Pat RobertsCharles (Pat) Patrick RobertsOvernight Finance: Lawmakers, Treasury look to close tax law loopholes | Trump says he backs gas tax hike | Markets rise despite higher inflation | Fannie Mae asks for .7B Senators working on fix to agriculture provision in GOP tax law Trump budget would slash crop insurance funds for farmers MORE has introduced legislation to establish a special inspector general to oversee the implementation of the Affordable Care Act.

Roberts is up for reelection this year and faces a primary challenge in August. The Kansas Republican said his bill would consolidate multiple agencies' oversight of the law's rollout.

"This monstrous law is so far reaching that it is difficult to find a federal agency that doesn’t have a hand in the pot," Roberts said in a press release.

But, Roberts argued, "The Health and Human Services Inspector General isn’t talking to the Treasury IG, or the Department of Labor IG, or the Homeland Security IG."

The inspector general created by Roberts's proposal would be called the Special Inspector General for Monitoring the Affordable Care Act. The office would have authority to review the functionality of, the costs of premiums, the effect of the requirement on businesses to offer health insurance for full-time employees, and how the Internal Revenue Service collects penalty payments from people who don't have insurance.