Sen. Lindsey Graham Lindsey Olin GrahamGOP senators say coronavirus deal dead until after election Tucker Carlson accuses Lindsey Graham of convincing Trump to talk to Woodward Trump courts Florida voters with moratorium on offshore drilling MORE (R-S.C.) said he won't be satisfied until the Trump administration and Congress crack down on Russia for meddling in the 2016 election.

Graham is the chairman of a Senate subcommittee that announced it would launch a probe into Russian interference in the race earlier Thursday.

“I will never feel satisfied until the Congress and the White House work together to punish Russia for trying to interfere with our election,” he told host Kate Bolduan on CNN’s “At This Hour.”

“I don’t think they changed the outcome, but they clearly tried to manipulate the outcome," Graham added, noting he is drafting a resolution aimed at penalizing Russia. "There needs to be new sanctions imposed against Russia for interfering in our election.”

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Graham added President Trump Donald John TrumpTrump says he doesn't think he could've done more to stop virus spread Conservative activist Lauren Witzke wins GOP Senate primary in Delaware Trump defends claim coronavirus will disappear, citing 'herd mentality' MORE must not show kindness to Russian President Vladimir Putin.

“If Donald Trump forgives Putin for what he tried to do in the election, that will scream weakness and the world will get more unstable,” said Graham, who competed with Trump during last year's GOP primary.

“An attack on one party by a foreign entity is an attack on all parties,” he added. "We’re in this all together. When one party is compromised by a foreign entity, the whole process is compromised.”

Graham's Senate Judiciary Subcommittee on Crime and Terrorism announced its coming investigation, which will also probe how to prevent similar attacks in the future, Thursday afternoon. The Senate Intelligence Committee is also looking into the issue, including any possible links between Russia and the Trump campaign.

“Our goal is simple — to the fullest extent possible we want to shine a light on Russian activities to undermine democracy,” Graham said in a joint written statement with Ranking Member Sheldon Whitehouse Sheldon WhitehouseRestaurant owner defends calamari as 'bipartisan' after Democratic convention appearance Warren calls on McConnell to bring Senate back to address Postal Service Senate Democrats demand answers on migrant child trafficking during pandemic MORE (D-R.I.).

A declassified intelligence community report concluded that Russia’s government meddled in the 2016 contest to help Trump win.

Moscow has denied any involvement in the election, and Trump has been reluctant to accept the intelligence agencies' findings.