Sen. Mark KirkMark KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns MORE (R-Ill.) is planning to introduce legislation to increase restrictions to President Obama's ability to transfer detainees out of Guantanamo Bay.

The Illinois Republican wrote in a Fox News op-ed Monday that he will introduce legislation "to block the transfer of [Guantanamo] detainees to terror hotspots such as Sudan, Libya, Somalia and Iran." 
 
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"Sending terrorists to live in state sponsors of terror and other dangerous countries defies common sense," Kirk said. 
 
The Obama administration is currently banned from bringing detainees into the United States, or from transferring them to Libya, Somalia, Syria, or Yemen as part of the National Defense Authorization Act for 2016. 
 
Unlike the annual policy bill, Kirk's legislation currently doesn't include a sunset, which could allow the ban to effectively become permanent.
  
Twelve detainees have previously been transferred to Sudan, three to Somalia and two have been transferred to Libya, according to a New York Times and NPR review. 
 
The Illinois Republican is expected to formally introduce his legislation once the Senate returns from its two-week recess next month. 
 
Kirk's legislation comes weeks after the administration handed over a long-anticipated plan to close the controversial facility. 
 
Kirk wrote Monday that Congress must block Obama from being able to shutter Guantanamo Bay, which he called the "best way to protect Americans at home and abroad from the threat these terrorists pose." 
 
Republicans quickly rejected Obama's plan, suggesting closing Guantanamo would undermine the country's ability to combat terrorism and gather intelligence. They've also suggested Obama's plan wouldn't close Guantanamo but instead move some detainees into the country, which could create fresh legal questions. 
 
Kirk added, in the op-ed, that he also supports cutting foreign aid to countries if the United States transfers a Guantanamo detainee into their custody and then the detainee either escapes or "re-engages in terrorism." 
 
Republicans are doubling down on national security as they look for an edge in the 2016 cycle, where they'll be defending 24 Senate seats. Kirk is among a handful of Republican senators who face tough reelection battles and could decide who controls the Senate next year.  
 
A memo released by his campaign last week touted Kirk's opposition to closing the Cuban facility and targeted Rep. Tammy Duckworth (D-Ill.), who he'll face in November. 
 
"Sen. Kirk opposes the president’s reckless call to close the prison at Guantanamo Bay while Tammy Duckworth wants to bring dozens of terrorists to the United States and ship others to failed states where they will most certainly rejoin their war on the West," according to the memo. 
 
Duckworth has long supported closing Guantanamo Bay, but her office didn't respond to questions late last month about if she specifically supports Obama's plan.