A group of five Republican senators on Thursday introduced legislation that would restrict those who live in Ebola-stricken countries from traveling to the United States, while allowing exceptions for some aid workers and foreign military members.

People who live in countries designated by the Centers for Disease Control and Prevention as having “widespread transmission of Ebola” would not be able to receive a visa to enter the United States, under the bill. Aid workers and foreign military authorized by the United States Agency for International Development and the Defense Department would be exempt. 

“To protect our security, we must stop Ebola at its source,” Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleySenate begins preparations for Trump trial Big Pharma looks to stem losses after trade deal defeat Appeals court skeptical of Trump rule on TV drug ads MORE (R-Iowa) said in a statement. “The best way to make this happen is to cease issuing visas or restricting entry to people from countries that are most impacted.”

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Grassley added that, “these countries simply don’t have the standards in place to properly screen travelers entering the United States.”

He is joined by Republican Sens. Marco RubioMarco Antonio RubioApple under pressure to unlock Pensacola shooter's phones Senators offer bill to create alternatives to Huawei in 5G tech Surging Sanders draws fresh scrutiny ahead of debate MORE (Fla.), Pat RobertsCharles (Pat) Patrick RobertsSenate GOP hopes to move new NAFTA deal before impeachment trial The Hill's Morning Report - Worries about war in world capitals, Congress Pompeo tells McConnell he's not running for Senate MORE (Kan.), John ThuneJohn Randolph ThuneSenate to vote on Trump's Canada, Mexico trade deal Thursday Senate braces for Trump impeachment trial Republicans face internal brawl over impeachment witnesses MORE (S.D.) and Mark KirkMark Steven KirkWhy Republicans are afraid to call a key witness in the impeachment inquiry Ex-Rep. Duffy to join lobbying firm BGR Bottom Line MORE (Ill.). All five senators, along with a slew of other lawmakers, have previously called for a travel ban. But the White House has resisted those calls and said that a ban could be counterproductive, encouraging travelers to lie about exposure to the virus.

Citing State Department figures, Grassley noted that the U.S. issued more than 6,300 visas to people from Liberia, Sierra Leone and Guinea from March until September 27. Those three countries would meet the guidelines for a travel ban under the bill and have been battling the current Ebola outbreak since March. 

Residents would be able to receive visas 60 days after the CDC says the virus is no longer rampant in their home country.