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Former Homeland Security Secretary Jeh Johnson testifies before the House Intelligence Committee in an open hearing in the U.S. Capitol Visitors Center June 21, 2017 in Washington, DC. (Chip Somodevilla/Getty Images)

Former Homeland Security Secretary Jeh Johnson lit up Twitter after he testified Wednesday in front of the House Intelligence Committee. He claimed the Russians "will be back" after targeting 21 states with cyber attacks during the 2016 presidential election.

"The Russians will be back???" wrote Gary Peters on Thursday. "What makes you think they ever left? The social media stuff is still ongoing! They want to divide US."

The hearing was part of an ongoing probe into Russian meddling into the election, and that officials should "assume" that "the Russians will be back, and possibly other state actors, and possibly other bad cyber actors."

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Others on Twitter questioned why President Donald Trump has been slow to show concern over the mounting evidence and testimonies that suggest that the Russian government played a part in the lead up to the election.

"So WHY is the President unconcerned? Why is it not anywhere on his Agenda?" wrote one user on the social media platform.

Johnson's testimony said that Russians targeted 21 states during the election with the purpose of influencing the election. This claim backs up a similar statement during the hearing by former FBI agent James Comey earlier this month.

"In 2016 the Russian government, at the direction of Vladimir Putin himself, orchestrated cyberattacks on our nation for the purpose of influencing our election — plain and simple," said Johnson on Wednesday. "Now, the key question for the President and Congress is: What are we going to do to protect the American people and their democracy from this kind of thing in the future?"

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Trump and his administration have resisted calls for action about the Russian's alleged intrusion into the election process. Press Secretary Sean Spicer said during the press conference that he hasn't spoken to the president about the Russian investigation.

President Trump took to Twitter Thursday and wrote that the investigation is a "hoax" set up by the Democrats.

Additionally, the president has called the investigation into his campaign's collusion with Russia a "witchhunt."

Conservative users on Twitter were skeptical of Johnson's claim, instead pointing to Johnson's admission that he has "no knowledge that votes were altered or suppressed."

"Based on everything I know, that is correct," Johnson told Rep. Mike Conaway (R-Tx.) "I know of no evidence that, through cyber-intrusions, votes were altered or suppressed in some way."