House Republicans are skeptical of President Obama’s decision to delay implementation of the Affordable Care Act’s employer mandate, and on Tuesday House Republican leaders sent Obama a letter requesting him to identify the legal justification for his action.

“We agree with you that many of the provisions in the law cannot be implemented within the current time frame,” the letter reads, “but we strongly disagree with you that time will ever remedy these predictable consequences of the law. Many have predicted the problems that your Administration now acknowledges, and each provision you delay continues to demonstrate that the entire law is unworkable.”

In addition to asking for the legal justification of the delay, the letter also asks Obama to identify the economic impact of the delay and any changes to federal outlays and revenues.

The letter also hints that House Republicans are considering legislation that would extend Obama’s employer mandate delay to all Americans. “Please also provide to Congress your justification for only delaying the employer mandate at this time and not the new mandate on individuals and families,” the letter says, “We agree with you that the burden was overwhelming for employers, but we also believe American families need the same relief.”

The letter is signed by Speaker John Boehner, R-Ohio, Majority Leader Eric Cantor, R-Va., Majority Whip Kevin McCarthy, R-Calif., House Republican Conference Chair Cathy McMorris Rodgers, R-Wash., Chief Deputy Whip Peter Roskam, R-Ill., Ways and Means Committee Chairman Dave Camp, R-Mich., Education & the Workforce Committee Chairman John Kline, R-Minn., House Budget Committee Chairman Paul Ryan, R-Wis., and Energy & Commerce Committee Chairman Fred Upton, R-Mich.

Anticipating further implementation problems, the letter also asks Obama to “please provide to us a complete list of all other provisions in the law that you expect to delay prior to October 1, 2013.”

You can read a full copy of the letter here.