(CNN) Republicans in the Senate have twice in 24 hours blocked the advancement of bills aimed at strengthening election security just hours after former special counsel Robert Mueller warned of the continued threat that foreign powers interfering in US elections.

Senate Majority Leader Mitch McConnell came to the Senate floor Thursday to personally object to House-passed legislation backed by Democrats. This comes after Republican Sen. Cindy Hyde-Smith of Mississippi objected to a trio of bills on Wednesday, in keeping with long standing GOP arguments that Congress has already responded to election security needs for the upcoming election.

Democratic Sens. Mark Warner of Virginia, Richard Blumenthal of Connecticut and Ron Wyden of Oregon had advocated for the bills on the Senate floor, asking for unanimous consent to pass the package, but that ask can be halted with an objection from any senator.

Two of those bills would require campaigns to report to federal authorities any attempts by foreign entities to interfere in US elections, and the third is aimed at protecting from hackers the personal accounts and devices of senators and some staffers.

On Thursday, McConnell called the House-passed legislation Democrats wanted to clear "so partisan it received just one Republican vote over in the House." He added that any election security legislation the Senate takes up must be bipartisan and also alleged that this bill is being pushed by the same Democrats who pushed the "conspiracy theory" of President Donald Trump and Russia.

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