The ad also links McCaskill to sending funds to Egypt and Libya before pivoting to linking the senator from Missouri to President Obama. 

"Here at home millions of people are out of work and our debt keeps climbing but Claire McCaskillClaire McCaskillA Cabinet position for Petraeus; disciplinary actions for Broadwell after affair Defense bill tackles retaliation against military sex assault victims Red-state Dems face tough votes on Trump picks MORE works with Barack ObamaBarack ObamaMan who plotted to kill Obama sentenced to 30 years Overnight Tech: FCC eyes cybersecurity role | More trouble for spectrum auction | Google seeks 'conservative outreach' director Madonna on Trump win: 'Women hate women' MORE to send our money to radicals who attack our embassies, burn our flag, and kill our diplomats," the voiceover continues. "What would you do? It's time to bring our tax dollars home and send Claire McCaskill home too."

Paul has been one of the Senate's most vocal opponents of foreign aid payments, especially to volatile Middle Eastern nations.

The campaigns for Mitt Romney and Obama both have sought to gain a political advantage over the attack on the U.S. Consulate in Benghazi, Libya, in September. Four staffers at the embassy, including the ambassador, died as a result of the assault.

Romney and Republicans have strongly criticized Obama for taking too long to characterize the attack as an act of terrorism. Democrats, in response, say Romney and his Republican surrogates are just trying to score political points by lobbing criticism about the attack.