Updated at 11:06 p.m.

Former Attorney General Eric Holder said Tuesday he envisions special counsel Robert Mueller's Russia investigation to be a "two-year case."

Holder also said the inquiry is moving "almost at light speed."

"I think this is a classic case. He's building from the bottom up," Holder said when asked about Mueller's strategy on MSNBC. "People have to understand that this is going to take some time. This is -- we're only about a year or so into this. From my view of this, I always thought this was about a two-year case."

"But they've been moving almost at light speed what they've done in the first year," Holder added.

Holder, who claims to have known Mueller for 20 to 30 years, predicted in March that the former FBI director will eventually charge Trump with obstruction of justice.

[Devin Nunes: 'It's possible' the Russians have dirt on James Comey]

Mueller's team is looking into Russian meddling in the 2016 election and possible collusion between the Trump campaign and Russia. The special counsel probe began in May 2017 after former FBI Director James Comey was fired by Trump.

At a different point in the interview, host Chris Hayes asked Holder if he was planning a run for president in 2020.



Is Former U.S. Attorney General Eric Holder running for president?



"Yeah, I'm thinking about it," he tells @chrislhayes



Watch. pic.twitter.com/HDGUJlxlS1 — MSNBC (@MSNBC) April 18, 2018



"Yeah, I'm thinking about it," Holder replied, adding that he has not made a final decision yet.

Holder served as attorney general under former President Barack Obama from 2009 to 2015.