Rep. Jose Serrano (D-N.Y.) announced on Monday that he has been diagnosed with Parkinson's Disease and will not seek reelection in 2020.

In a statement, Serrano said that, after his diagnosis, he initially “planned to continue my work representing the people of the South Bronx far into the future.”

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But he said that he had concluded that the nature of the disease and its unpredictable rate of advancement prompted his decision not to seek a 16th term in the House.

"Although this disease has not affected my work in Congress, over the last few months I’ve come to the realization that Parkinson’s will eventually take a toll, and that I cannot predict its rate of advancement," Serrano, 75, said.

"Because of this uncertainty, I do not intend to seek re-election in 2020. I do intend to serve the remainder of my term in the 116th Congress."

Serrano’s announcement came moments after Sen. Tom Udall Thomas (Tom) Stewart UdallLWCF modernization: Restoring the promise OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency MORE (D-N.M.) announced that he also would not seek reelection in 2020, leaving his New Mexico Senate seat up for grabs.

Serrano, who has represented the Bronx in the House since 1990, is the longest-serving Latino congressman in history. He is a member of the powerful House Appropriations Committee and the chair of the Commerce, Justice, Science Subcommittee.

His district, New York’s 15th, is almost certain to remain in Democratic hands after Serrano’s retirement. Last year, he won reelection with 96 percent of the vote. In the 2016 presidential election, Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE attracted nearly 94 percent of the vote in Serrano's district.

Serrano’s announcement comes as a number of Democrats weighed potential primary challenges to the 15-term congressman, including New York City Council member Ritchie Torres, who is exploring a potential run for the House seat.

-- Updated at 1:54 p.m.