A group of conservative organizations that are seeking to repeal the new health care law sent a letter to House Speaker John Boehner, R-Ohio, and Senate Minority Leader Mitch McConnell, R-Ky., telling them to demand a one-year delay “at minimum” as they negotiate a fiscal 2014 spending bill.

The letter, spearheaded by anti-tax lobbyist Grover Norquist, is signed by the heads of 18 other organizations that include the Galen Institute, Citizen Outreach and Concerned Women for America.

The letter urges McConnell and Boehner to demand a one-year delay even in the negotiations for a short-term measure to keep the government running while the two parties work out a larger deal.

Republican leaders have been cool to the idea put forward by a group of conservative House and Senate lawmakers who want to block a budget deal unless it defunds Obamacare.

The demand put foward by Norquist, who heads Americans for Tax Reform, could be used as a compromise in the overall budget process, though it is unlikely GOP leaders will insist on it as they negotiate the temporary stopgap bill.

The letter cites evidence that the health care law is not ready to be implemented, pointing to the Obama administration’s decision to delay the employer mandate by one year, the lack of an income verification system to ensure subsidies are being fairly distributed, and the tax increases that will be part of the law.

“The American people should not be forced to pay higher taxes for a system that isn’t ready,” the group said in the letter.