(CNN) Two leading senators are asserting that President Donald Trump has not focused on the clear threat the Kremlin poses in the 2018 elections, with one Republican on the Senate Intelligence Committee contending that Russian hackers may have already targeted most -- if not all -- sitting US senators.

Ratcheting up the push for a more robust US response to Russian interference in the midterms and 2020 elections, Republican Sen. James Lankford of Oklahoma and Democratic Sen. Amy Klobuchar of Minnesota are now slated to get a committee vote this month on a bipartisan bill is aimed at shoring up the nation's election system. But the two senators said their plan has run into hurdles for months -- and say the Russian threat is real headed into the midterms.

In a joint interview as the primary season wraps up and with the November midterms less than 100 days away, the senators told CNN Wednesday that there is far more that has to be done -- from the White House on down to the states.

"The intelligence community has been very active on this, the Department of Homeland Security has been active on this," Lankford said. "While the President has been inconsistent in his tweets, and some of the messaging that he's put on it, he's the only one in the government that hasn't been paying attention to this."

Klobuchar added: "There were clearly delays based on things the President was saying that weren't really directing their people to coordinate, they've admitted that under oath. But from the very beginning, Director (Dan) Coats made it clear that Russia has been emboldened and they're getting bolder."

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