A separate source familiar with the meetings said White House senior adviser Stephen Miller, who has often acted as the leading adviser on Trump's immigration policies, is "being consulted but is not intimately involved".
Cummings also announced his intention to subpoena Newbold's former supervisor, Carl Kline, who now works at the Department of Defense. Rep. Jim Jordan (R-OH), however, sees it as a "partisan attack on the White House".
After deposing Kline, Cummings said the committee would interview others from the White House, including the current chief security officer, former Chief Security Officer Cory Louie, Chief Operating Officer Samuel Price, former Deputy Chief of Staff Joseph Hagin and Deputy Director of Administration William Hughes.
Separately, the House Judiciary Committee said on Monday that it will this week issue subpoenas to obtain Special Counsel Robert Muller's full report on Russian meddling in the 2016 presidential election.
In a letter to the White House on Monday, Cummings said Newbold detailed the cases of three anonymous "senior White House officials" whose clearances career officials recommended should be denied, though the White House went ahead and granted clearances to two of the three unnamed individuals.
Trump's opponents made the opposite claim, asking Representative Cummings to subpoena Jared and Ivanka as "national security threats".
Ocasio-Cortez rips Trump security clearance scandal
"Every day that there is an insecure line of communication that could be leaked, that could be hacked, that could be screenshotted, without proper channels, is a day that we are putting our national security at risk", she added.
"We can not have people who have not been cleared - and we have serious questions to their criminal records, drug use, financial, and foreign relationships", Cummings said following the committee meeting.
Without naming him, Rep. Alexandria Ocasio-Cortez, D-N.Y., railed against Kushner's use of WhatsApp to communicate with acquaintances overseas, an allegation made by a committee Democrat who spoke with his lawyer about the matter previous year. They also called the move by Cummings "reckless".
"The historical evidence suggests, there's not a lot of evidence, but it's all we've got, that it slightly favors Republicans among people who've fit this model in the past in Florida", DeFoor told The Sentinel. "He's had a great team in place helping to implement it and I hope I've played a good part in pushing those objectives forward", Kusner replied.
"Because of the president's leadership, I think the world is safer today", he said. I complied with all the different investigations, whether it be the Senate, the House, the special counsel.
"I disclosed all of my holdings for the Office of Government Ethics, and what I did with them is they told me what to divest, what to keep, what rules to follow".
"On the other hand", Kushner added, "you could look at it and say that because the media's been so distracted with Russia, Russia, Russia and all of these insane conspiracy theories, we've been able to operate underneath that level and just be really effective".