"Why didn't they stop them?", Trump asked.
All 17 intelligence agencies have agreed Russian Federation was behind the hack of Democratic email systems and tried to influence the 2016 election to benefit Mr Trump.
In March, James Comey, then the Federal Bureau of Investigation director, publicly announced that the FBI was investigating whether the Trump campaign colluded in any way with Russian officials during the election.
In a third tweet Thursday, Trump sought to use Johnson's testimony as proof of his vindication in the Russian Federation investigation.
Spokeswoman: Trump thinks election hacking 'probably was Russia'
The Senate committee was hearing from officials at the Homeland Security Department and the FBI's counterintelligence division . Trey Gowdy had earlier asked Johnson pointedly whether he knew of any evidence of possible collusion by the Trump campaign.
DNC officials have claimed that the offer from the DHS came months after the revelation of the hack and after the Federal Bureau of Investigation had begun their work in stopping the intrusion. Noting that Russia's overall goal was to shake confidence in the United States' ability to have an election, Earnest said it would have been "irresponsible" for the administration to have taken more active public steps expressing worry about Russia's actions.
But he also added, "I am not in a position to know whether the successful Russian government-directed hacks of the DNC and elsewhere did in fact alter public opinion and thereby alter the outcome of the presidential election".
In what has become typical fashion, President Trump blamed the Obama administration for failing to "stop" Russian meddling in the 2016 presidential election.
He also says one of the presidential candidates was claiming the election was rigged. Those alterations were discovered and fixed but Time doesn't say when that investigation took place.
Last month, Trump fired FBI Director James Comey, who was leading the agency's Russian Federation probe.
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Johnson was pressed during Wednesday's hearing about why more was not done to combat Russia's meddling efforts. That report said Russian intelligence services had "obtained and maintained access to elements of multiple USA state or local electoral boards".
"From whom? And with what level of knowledge?" the former top Democratic staffer on the House Intelligence Committee, Michael Bahar, told TIME.
Mr Trump has picked fights with intelligence agencies in the past, blaming them for leaks about his associates' Russian Federation ties.
US officials believe that Russian intelligence agencies carried out email hacks against the DNC and Hillary Clinton campaign and released documents through WikiLeaks and other websites. With the benefit of hindsight, I can tell you for certain that in the late-summer, fall, I was very concerned about what I was seeing. "Are we living in Nazi Germany?" he tweeted in January.
White House press secretary Sean Spicer recently refused to answer whether Donald Trump believes Russian Federation attempted to influence our election.
Every United States intelligence agency concluded months ago that Russian Federation was behind the hacking of Democratic organizations during the 2016 election.
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The Philadelphia 76ers introduced #1 overall National Basketball Association draft pick Markelle Fultz to the city on Friday. Because what really stood out to me was the enthusiasm, and what this Sixers team is starting to mean to Philadelphia.
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