Cullen, a former Virginia attorney general, served as the USA attorney for the Eastern District of Virginia under President George H.W. Bush and worked on President George W. Bush's legal team during the Florida recount in the 2000 presidential election.
That's according to a statement from Pence spokesman Jarrod Agen.
"It's very routine", Pence said.
US Vice President Mike Pence hired a personal attorney to deal with inquiries related to the ongoing probe into Russia's alleged meddling in the 2016 election and possible collusion between President Donald Trump's campaign and Moscow.
Yesterday, Mueller citing reports from Washington Post, is now looking into alleged Russian interference in the 2016 USA presidential election and possible collusion with the Trump campaign.
Pence's outside counsel selection process has been going on for weeks, and there was no singular event that prompted his decision to hire an outside lawyer.
Cullen referred all requests for comment to Pence's office.
Trump's young presidency has been battered by allegations - under investigation both by Congress and the FBI, that Russian Federation interfered to sway the 2016 election in his favor, in possible collusion with Trump's campaign team.
On Wednesday, The Washington Post reported that Trump may in fact be investigated by Mueller for possible obstruction of justice. He delivered an on-camera statement sharply criticizing James Comey after the former Federal Bureau of Investigation director's recent testimony before the Senate Intelligence Committee. They will be National Security Agency Director Mike Rogers, Director of National Intelligence Dan Coats, and retired deputy NSA director Richard Ledgett. Both suits take issue with Trump's continued association with the Trump Organization, which manages much of the real estate bearing the Trump brand.
Republican Senator John Thune defended Mueller's integrity and said he needs to be able to continue to do his job and get to the bottom of the issues. He was a press aide to then-U.S. Rep. M. Caldwell Butler, R-6th, before he joined what was then McGuire Woods & Battle in 1977.
Of course Trump had something to say on his Twitter, "They made up a phony collusion with the Russians story, found zero proof, so now they go for obstruction of justice on the phony story".