Sen. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (R-Fla.) said Sunday that the U.S. must act forcefully against Saudi Arabia if the country is found to be responsible for the death of Washington Post columnist Jamal Khashoggi, warning that an inadequate response would undermine America's role as a human rights watchdog.

“No matter how important they might be to our Iranian strategy, our ability to be a voice for human rights… is undermined and compromised if we are not willing to confront something as atrocious as what’s allegedly happened here," Rubio said on CNN's "State of the Union."

"How can we criticize [Russian President] Putin for killing journalists if we allow an ally to do the same?" he added.

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Rubio said he doesn't believe the president should rule out any potential response to Saudi Arabia, including pulling out of weapons deals between the two countries.

"It can’t be symbolic. It can't just be words," Rubio said.

He added that the country should not continue to conduct "business as usual" with the Saudis when asked whether Treasury Secretary Steven Mnuchin Steven Terner MnuchinHillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars Treasury: Trump's payroll tax deferral won't hurt Social Security Treasury sanctions individuals, groups tied to Russian malign influence activities MORE should attend an upcoming economic summit in Saudi Arabia.

"I believe the Trump administration will do something," Rubio said. "The president has said that. But if he doesn’t, Congress will. That I can tell you."

Rubio on Trump’s response on the missing Saudi Journalist Jamal Khashoggi: “I’m glad the President didn’t tie his hands in terms of exactly what we are going to do. But it needs to be very strong and meaningful, it can’t be symbolic, it can’t be just words” #CNNSOTU pic.twitter.com/1kdmXxPfQz — CNN Politics (@CNNPolitics) October 14, 2018

Khashoggi disappeared nearly two weeks ago after he entered the Saudi consulate in Istanbul and was not seen leaving. Khashoggi, an American resident, wrote for the Washington Post and was a frequent critic of Saudi leadership.

Turkish officials have said he was murdered there on orders from Saudi officials, and The Washington Post reported that there is audio and video that proves Khashoggi was tortured and killed.

Saudi officials have denied the claims.

Trump has expressed concern about Khashoggi’s disappearance, and vowed there would be “severe punishment” if Saudi Arabia was found to be behind the journalist’s death.

He has, however, stopped short of saying Saudi Arabia was responsible for the killing, and voiced reluctance to altering the weapons deals between the U.S. and the Saudis.

Senators last week invoked sanctions law that requires the president to investigate Khashoggi's disappearance.