During his tenure as U.S. Attorney, his office successfully investigated and prosecuted several high-profile cases including the conviction of a group responsible for the largest theft of electronic personal identity data up to that time.

[4] After leaving the U.S. Attorney's Office, Cummins re-entered private practice, specializing in white-collar criminal matters, complex multi-party litigation, and compliance.

In 2015, Cummins re-entered the political arena when he agreed to serve as the Arkansas chairman for the presidential campaign of New Jersey Governor Chris Christie.

[9] Early in the congressional investigations of the firings, Deputy Attorney General Paul McNulty testified that Cummins was removed for no reason except to install a former aide to Karl Rove: 37-year-old Tim Griffin, a former opposition research director for the Republican National Committee.

Sara Taylor and Scott Jennings later testified that they believed Cummins to be a sub-par attorney based solely on statements made by his intra-party rival, Tim Griffin.

Cummins told the Senate Judiciary Committee "that Mike Elston, the deputy attorney general's top aide, threatened him with retaliation in a phone call [in February 2007] if he went public.

"Cummins' statement at the time included a specific reference to Blunt, which he acknowledged was unusual, but was consistent with department policies and justified in light of leaks and erroneous reporting.

In response to inquiries from reporters with Talking Points Memo[19] and ABC News,[20] Cummins confirmed that as early as October 2018 he had acted "as an intermediary between certain Ukrainian interests and federal law enforcement.

"[19] Cummins had been hired to represent Ukrainian prosecutor general Yuriy Lutsenko and connect with "high level" U.S. authorities to present allegations of corruption by Joe Biden and his son, Hunter.

He further noted that, in his communication with Geoffrey Berman, the US attorney for Manhattan, he said he could not vouch for the veracity of the Ukrainian information, but was passing it along as a matter he considered appropriate for further investigation by an appropriate federal law enforcement agency.