California Gov. Gavin Newsom issued a statement Monday evening addressing President Donald Trump's decision to withdraw the United States from the Paris Agreement, an international treaty whose purpose is to unite governments in taking action against climate change.

"If you don't believe in science, believe your own damn eyes," Newsom said, providing accompanying photos of the fires in Los Angeles County.

Trump's executive action regarding the Paris Agreement, which was signed on his first day back in office, was just one of a handful rollbacks related to climate and the environment.

-ABC News' Marilyn Heck

Marking President Donald Trump's second inaugural ball of the evening, the Trump family and JD Vance and his wife, Usha, all slow danced onstage.

The American Civil Liberties Union has filed a lawsuit challenging President Donald Trump’s executive order that ends birthright citizenship for children born to undocumented immigrants.

The lawsuit was filed on behalf of several organizations “with members whose babies born on U.S. soil will be denied citizenship under the order,” the ACLU said in a statement.

“Denying citizenship to U.S.-born children is not only unconstitutional — it’s also a reckless and ruthless repudiation of American values," said Anthony D. Romero, executive director of the ACLU. "Birthright citizenship is part of what makes the United States the strong and dynamic nation that it is."

"The Trump administration's overreach is so egregious that we are confident we will ultimately prevail,” he added.

The plaintiffs say birthright citizenship is protected by the 14th Amendment.

“For families across America today, birthright citizenship represents the promise that their children can achieve their full potential as Americans. It means children born here can dream of becoming doctors, lawyers, teachers, entrepreneurs, or even president—dreams that would be foreclosed if their citizenship were stripped away based on their parents’ status,” the groups represented by the ACLU said in the filing.

-ABC News' Armando Garcia

The brother of fallen Capitol Police officer Brian Sicknick gave his first reaction to ABC News on Monday evening after President Donald Trump pardoned of over 1,500 convicted Jan. 6 rioters.

On the call, Craig Sicknick was in shock and called the pardons a "betrayal of decency."

"The man doesn't understand pain or suffering of others. He can't comprehend anyone else's feelings," he said.

"We now have no rule of law," he added.

Sicknick also said he is now personally concerned for his safety.

His brother, Brian, was brutally attacked by rioters, video evidence shows. The 42-year-old military veteran, who worked at the Capitol for 12 years, died a day later after suffering two strokes.

A medical examiner said he died of natural causes, but also said "all that transpired on that day played a role in his condition."

Five members of Sicknick's family testified in a February 2023 trial against George Tanios and Julian Khater, the men who pepper-sprayed Brian Sicknick, describing the loss of a son, a father, a brother, a partner -- and a fellow officer with the Capitol Police.

-ABC News' Alexander Mallin