The politician, who advocates statehood for the U.S. territory of Puerto Rico, had said in March that he would seek reelection in polls scheduled for November 2020.
Rossello went on Facebook Live Sunday evening and said that while he will not seek reelection next year, he does intend to finish his term as governor despite calls for him to resign. "A significant sector of the population has been protesting for days".
The messages included homophobic, misogynistic and sexist comments about his opponents - and even mocked victims of Hurricane Maria. "Whoever wasn't sure about going to the march tomorrow has now made up their mind to go".
The calls to oust the governor have caught the attention in the mainland USA and several officials, including presidential candidate Julián Castro, have come out in support of the protesters.More news: Man injured after vehicle drives through crowd at Irish cemetery
But Puerto Rico's Senate President Thomas Rivera Schatz, who may takeover leadership of the pro-statehood PNP, said Rossello's actions "put an end to part of the controversies and trauma hitting our people".
The speaker of Puerto Rico's House of Representatives set up an independent panel on Friday to investigate whether the chats constituted crimes or warranted impeachment.
"I admit that apologizing is not enough".
The political turmoil comes at a critical stage in the USA territory's bankruptcy process as it tries to restructure around $120 billion in debt and pension obligations.More news: Expedition 60 crew launches to space station on Apollo 11 anniversary
In another, a mocking comment is made about bodies piled up in the morgue after Hurricane Maria, which left almost 3,000 dead.
Ricky Martin and Lin-Manuel Miranda have joined the cause as tens of thousands are expected to take the streets on Monday.
His official residence has been under siege this week as hundreds of thousands of protesters gathered outside La Fortaleza, the governor's official residence.More news: Loki Disney+ Series Confirmed for Spring 2021 Release