Sens. Mark Kirk (R-Ill.) and Robert Menendez (D-N.J.) are pushing a 10-year extension for an Iran sanctions bill days ahead of a deadline to finalize a long-term deal on the country's nuclear program.  

The two senators, who have been at the forefront of a push to increase sanctions against the Iranian government, want to extend the Iran Sanctions Act, currently set to expire at the end of next year, through 2026. 
The move comes as officials from the United States, Iran and five other countries face a June 30 deadline to lock down a final agreement that would limit Iran's nuclear program in exchange for sanctions relief. 
 
The legislation is the latest sign of increasing skepticism from lawmakers, particularly Republicans, who are lining up against a potential deal ahead of the deadline.