Sen. Bob Casey Robert (Bob) Patrick CaseySecond GOP senator to quarantine after exposure to coronavirus GAO report finds brokers offered false info on coverage for pre-existing conditions Catholic group launches .7M campaign against Biden targeting swing-state voters MORE Jr. (D-Pa.) on Friday announced that he will not mount a bid for the White House in 2020.

In a statement, Casey accused President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE of undermining key institutions in the U.S., casting a Democratic win in 2020 as crucial to protecting the country against an “erratic” president.

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“With all of these challenges confronting us and with our Commonwealth playing a potentially decisive role in the 2020 vote, I believed it was important for me to at least consider the monumental undertaking of running for President,” Casey said in a statement.

“After two months of considering it, I have concluded that the best way for me to fight for the America that so many of us believe in is to stay in the U.S. Senate and not run for the presidency in 2020.”

A likely crowded Democratic field has started forming in the last month with Sens. Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE (D-N.Y.) and Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) and former Housing and Urban Development Secretary Julián Castro all announcing bids for the White House.

Casey had been floated as a potential 2020 contender, especially after his successful reelection bid last year in a state that Trump carried narrowly in 2016.

Casey’s win in 2018 put him in the same league as other potential 2020 hopefuls, like Sen. Sherrod Brown Sherrod Campbell BrownBipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (D-Ohio), who similarly won reelection last year in a state that has leaned more recently towards Republicans.

Casey, a former Pennsylvania state treasurer, said on Friday that he believed Democrats would nominate a presidential candidate capable of winning his home state and, ultimately, the White House.

“2020 is not the time for me to run for President, but it is the right time for me to continue to fight the battles I have fought as U.S. Senator and state official,” he said. “I have no doubt that our Democratic Party will nominate a candidate who can win Pennsylvania and the Presidency.”

A handful of other Democrats are expected to announce their 2020 intentions in the coming weeks and months, including former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE and Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.).

--Updated at 9:43 a.m.