The second aide, Sean Misko, worked as an NSC aide until 2017. He was also part of Secretary of State Hillary Clinton's policy planning staff under Deputy Chief of Staff Jake Sullivan. He joined the Intelligence Committee as a staffer in August, the same month the whistleblower filed his complaint.
A source who spoke to the Washington Examiner had reason to believe both Grace and Misko were untrustworthy (emphasis mine):
A source familiar with Grace's work at the NSC told the Washington Examiner, “Abby Grace had access to executive privilege information, and she has a duty not to disclose that information. She is not authorized to reveal that information.”
The same source said that Misko had not been trusted by Trump appointees. “There were a few times where documents had been signed off for final editing before they go to the national security adviser for signature,” the source said. “And he actually went in and made changes after those changes were already finished. So he basically tried to insert, without his boss’ approval.
“There were meetings in which he protested very heavily, and next thing you know, there's an article in the paper about the contents of that meeting.”
Misko often clashed with other NSC personnel at meetings, another source said. Both Grace and Misko were close to Lt. Gen. H.R. McMaster, Trump's national security adviser from Feb. 2017 until May 2018.
Misko was a CNAS fellow in 2014. Misko’s name surfaced in the Hillary Clinton email controversy when he worked in the State Department during the Obama administration.
In a Dec. 1, 2009, email released by Judicial Watch, Clinton adviser Huma Abedin sent classified information regarding foreign military contributions to the Afghanistan war effort to her private email account. That email originated with Misko, who wrote to Sullivan that he initially “accidentally” sent it on the “high side” (secure) but was sending the email again.
https://www.washingtonexaminer.com/news/adam-schiff-defends-intelligence-hires-as-president-fumes
Adam Schiff defends intelligence hires as president fumes
February 07, 2019
The Hill reported one of the hires was Abigail Grace, who served on the NSC staff from 2016-2018. It was not clear if she was the only person hired who had worked on the NSC staff during the Trump administration.
Trump fumed about the hires Thursday morning on Twitter, accusing Democratic-led committees of “stealing” people who work at the White House.
“A continuation of Witch Hunt!” he wrote.
http://www.freerepublic.com/focus/f-news/3582174/posts
Comey Was Prepared To Exonerate Clinton LONG BEFORE FBI Investigation Was Over
08/31/2017
Comey had already concluded the result of the FBI investigation into Hillary Clinton without interviewing Clinton, her top aides, or the computer specialist that set up her computer server, including Paul Combetta, Cheryl Mills, and Bryan Pagliano.
The letter from the Judiciary Committee says:
These individuals had intimate and personal knowledge relating to Secretary Clinton's non-government server, including helping her build and administer the device. Yet, it appears that the following key FBI interviews had not yet occurred when Mr. Corney began drafting his exoneration statement:
1. May 3, 2016 - Paul Combetta
2. May 12, 2016- Sean Misko
...