Getty Images
Now playing
01:05
Remind me ... who is Paul Manafort?
CNN
Now playing
11:01
Keilar and Berman: Vote shows GOP cares about police ... until they don't
weisselberg
JB Miller/Trump Organization
weisselberg
Now playing
01:43
NYT: Trump finance chief could face charges as early as this summer
Getty Images
Now playing
03:25
See top Trump DOJ official's two-word response to election probe request
US President Joe Biden gives a press conference after the NATO summit at the North Atlantic Treaty Organization (NATO) headquarters in Brussels, on June 14, 2021.
OLIVIER HOSLET/AFP/POOL/Getty Images
US President Joe Biden gives a press conference after the NATO summit at the North Atlantic Treaty Organization (NATO) headquarters in Brussels, on June 14, 2021.
Now playing
01:25
Biden calls on foreign leaders to protect against 'phony populism'
CNN
Now playing
01:39
Honig: Emails show Trump had his enablers
Senate TV
Now playing
05:54
McConnell dismisses Trump DOJ's secret seizure of data
POOL
Now playing
02:47
'Surprise is an understatement': Reporter on lawmaker's apology
WAVE
Now playing
01:52
McConnell vows to deny Biden SCOTUS pick if GOP wins back Senate
Now playing
02:31
Merrick Garland announces plan to combat domestic terrorism
arizona election audit murray ebof vpx_00001313.png
arizona election audit murray ebof vpx_00001313.png
Now playing
02:19
Ballot maker: We've never seen an audit conducted this way
CNN
Now playing
02:30
Rep. Stewart makes false claim about Rep. Marjorie Taylor Greene
UNITED STATES - JUNE 9: Attorney General Merrick Garland arrives for the Senate Appropriations Subcommittee on Commerce, Justice, Science, and Related Agencies hearing on the proposed budget for fiscal year 2022 for the Department of Justice on Wednesday, June 9, 2021. (Photo by Bill Clark/CQ Roll Call via AP Images)
Bill Clark/CQ Roll Call/AP
UNITED STATES - JUNE 9: Attorney General Merrick Garland arrives for the Senate Appropriations Subcommittee on Commerce, Justice, Science, and Related Agencies hearing on the proposed budget for fiscal year 2022 for the Department of Justice on Wednesday, June 9, 2021. (Photo by Bill Clark/CQ Roll Call via AP Images)
Now playing
02:34
Merrick Garland releases statement regarding leak probes
Now playing
08:21
'Very offensive': Mom of US Marine jailed in Russia reacts to Putin's comment
Now playing
02:38
CNN's Barbara Starr: No idea why the DOJ snuck into my life
NYC Mayor's Office/CNN
Now playing
06:15
Keilar: NYC's mayor has zero you-know-whats to give
CNN —  

Paul Manafort is in the hospital after suffering a heart ailment while in prison, a source familiar with the matter said Tuesday.

The former Trump campaign chairman is serving a seven-and-a-half-year sentence in a Pennsylvania prison for financial crimes that stemmed from special counsel Robert Mueller’s investigation.

He was admitted to the hospital on Thursday, lawyer Todd Blanche said. Blanche said Manafort was in stable condition, though he said that he, along with Manafort’s family, was being kept in the dark about the full extent of Manafort’s medical condition.

A spokeswoman for the Federal Bureau of Prisons declined to comment, citing safety and privacy concerns for inmates.

News of Manafort’s medical status, which was first reported by ABC News, came the same day that his longtime deputy, Rick Gates, was sentenced on charges also born from the special counsel’s probe.

Gates was sentenced to 45 days in jail and three years probation by a federal judge in Washington on Tuesday. Gates had pleaded guilty last year to conspiracy and lying to the FBI, and had admitted to helping Manafort conceal $75 million in foreign bank accounts from their years of lobbying for Ukraine.

Manafort has been in poor health throughout the past two years, appearing at times for court hearings in a wheelchair and substantially grayed. One of his lawyers said last year that he was having “significant issues” with his health related to the “terms of his confinement” in a jail as the case progressed.

Manafort was due in court Wednesday on separate charges filed in New York state court by the Manhattan district attorney. Manafort will not appear for the hearing, Blanche said, but the case is expected to continue and a judge is likely to rule on a request by Manafort to dismiss the state charges on double jeopardy grounds.

Blanche protested a lack of information from the Bureau of Prisons in a statement Tuesday, saying Manafort’s family and friends “still do not have a full understanding of his medical condition or well-being.”

CNN’s Kara Scannell and Evan Perez contributed to this report.