Republicans are touting a bill to prohibit federal funding for so-called "sanctuary cities" like San Francisco that do not prosecute undocumented immigrants. 

One of the sponsors of the measure, Sen. Pat ToomeyPatrick (Pat) Joseph ToomeyNSA improperly collected US phone records in October, new documents show Overnight Defense: Pick for South Korean envoy splits with Trump on nuclear threat | McCain blasts move to suspend Korean military exercises | White House defends Trump salute of North Korean general WH backpedals on Trump's 'due process' remark on guns MORE (R-Pa.), said in the Republican weekly address on Saturday that the Stop Sanctuary Policies Act would "addresses the terrible problem of ‘sanctuary cities'" and "help make our communities safer.

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"Under this commonsense legislation, sanctuary cities would lose federal funds if they maintain these dangerous policies," he said. "We have to take this step in order to get these cities to do the right thing and stop undermining our immigration laws." 

Toomey said the GOP-led Senate will vote on the anti-sanctuary cities bill, which he is co-sponsoring with Sen. David VitterDavid Bruce VitterThe biggest political upsets of the decade Red-state governor races put both parties on edge Louisiana Republicans score big legislative wins MORE (R-La.) next week.

"The Senate will vote on this legislation Tuesday," he continued. "I urge you to speak out and encourage your Senators to vote for the Stop Sanctuary Policies Act and help keep our communities safe." 

The fight over sanctuary cities comes at time when Congress is gridlocked over reforms to federal immigration policies. 

The Senate approved a high-profile immigration bill in 2013, but the House has refused to take up the measure.

The Obama administration has threatened to veto previous efforts to block funding to sanctuary cities, citing a 2014 executive order from Obama that directs federal officials to focus deportations on convicted criminals.

Toomey said in the weekly address that cutting off funding to cities that ignore federal immigration laws "should be a bipartisan effort." 

"President Obama’s own Secretary of Homeland Security has declared that sanctuary cities are, quote, ‘not acceptable’ and ‘counter-productive to public safety.’ After all, we’re talking about criminals who the Obama Administration already has deemed dangerous enough to deserve removal from our country."