Ahead of former President Donald Trump's address at the Conservative Political Action Conference in Orlando, Florida, Sunday afternoon, ABC News Chief Anchor George Stephanopoulos asked former New Jersey Governor and ABC News contributor Chris Christie about statements made by Republican leaders in recent weeks.

"Three weeks ago, you had Mitch McConnell saying the president bears responsibility for the siege.  Kevin McCarthy says the same thing.  Kevin McCarthy's at CPAC saying this is Trump's Republican Party.  Mitch McConnell says he'd vote for him in 2024," Stephanopoulos said.

"The bottom line is this, George.  You know, Donald Trump is not a departing two-term president like George W. Bush was and as a result, he's got an opportunity to come back again if he wants to.  And there are going to be some in the party who want him and there are going to be some in the party who don't," Christie said. "But what is consistent is many of the policies that were pursued over the last four years -- take aside the personality; take aside the tweets -- a lot of those policies are things that Republicans support."

The U.S. Food and Drug Administration authorized use of a third COVID-19 vaccine in the U.S., declaring the Johnson & Johnson vaccine safe and effective in adults 18 and older.

ABC News Chief Anchor George Stephanopoulos asked Dr. Anthony Fauci about hesitancy from people over its reported efficacy compared to others.

"What do you say to those who want to wait for Moderna and Pfizr?" Stephanopoulos asked.

"We have to get away from that line of thought," Fauci responded. "We have three highly efficacious vaccines. Safe and efficacious."

"If I went into a clinic and said we have JJ now, I would take the one that is available to me now," Fauci continued.

The White House released a letter Saturday from President Biden to the speaker of the House and president pro tempore of the Senate on the airstrike in eastern Syria, in his effort to keep Congress "fully informed, consistent with the War Powers Act."

"I directed this military action consistent with my responsibility to protect United States citizens both at home and abroad and in furtherance of United States national security and foreign policy interests, pursuant to my constitutional authority to conduct United States foreign relations and as Commander in Chief and Chief Executive. The United States took this action pursuant to the United States' inherent right of self-defense as reflected in Article 51 of the United Nations Charter," Biden wrote in the letter.

This comes following some bipartisan criticism the White House received over the decision to carry out the airstrike in Syria.

-ABC News' Molly Nagle

As Biden departed the White House to board Marine One Saturday afternoon, he was asked if he planned to punish Saudi Arabia’s crown prince following a U.S. intelligence report that concluded he ordered the killing of journalist Jamal Khashoggi.

Biden carefully teased an announcement but said it wouldn’t specifically pertain to Khashoggi’s murder.

He said, “there will be an announcement on Monday as to what we’re going to be doing with Saudi Arabia in general.”

The president then left the White House for Delaware.

On Friday the Office of Director of National Intelligence released a highly anticipated report on the death of Khashoggi, a Washington Post columnist and Saudi dissident who was murdered and dismembered at the Saudi consulate in Istanbul in Oct. 2018.

It revealed the U.S. intelligence community found Saudi Arabia’s Crown Prince Muhammad bin Salman approved an operation to capture or kill him.

The Saudi government has denied that that the crown prince was involved and instead blamed the death on a rogue team of government agents.

The killing has roiled the United States' longstanding ties with Saudi Arabia.

Biden said he spoke to King Salman on Thursday, one day before the report was released.

Judge Merrick Garland's confirmation hearing for his nomination as the nation's next attorney general is now underway in front of the Senate Judiciary Committee. Garland is expected to face tough questions on everything from combating the nation's domestic terror crisis in the wake of the Jan. 6 insurrection, calls for racial justice and equity in the criminal justice system, restoring the department's independence and how he'll handle politically-sensitive investigations into President Joe Biden's son Hunter and special counsel John Durham's probe into the origins of the Russia investigation.

"The President nominates the Attorney General to be the lawyer -- not for any individual, but for the people of the United States," Garland told the Senate Judiciary Committee in his opening statement according to remarks released over the weekend.

Garland's appearance comes nearly five years after Senate Republicans, including some currently sitting on the committee he'll be in front of today, refused to hold hearings on his nomination by former President Barack Obama to replace the late Justice Antonin Scalia on the Supreme Court.

However, based on remarks from Sen. Chuck Grassley, R-Iowa, who is expected to address their previously stonewalling of Garland's nomination by shifting to attack Democrats for their treatment of Supreme Court Justice Brett Kavanaugh during his confirmation.

"So yes, it’s true that I didn’t give him a hearing. I also didn’t mischaracterize his record. I didn’t attack his character. I didn’t go through his high-school yearbook. I didn’t make his wife leave the hearing in tears. I took a position on hearings, and I stuck to it," Grassley will say.

Garland could also be forced to walk a fine line as he faces potential questions of whether his department should launch investigations into former President Donald Trump for his role in inciting the Jan. 6 riot at the Capitol, after Senate Minority Leader Mitch McConnell recently raised the prospect after his vote against convicting Trump that the ex-president still be held accountable by the criminal justice system.

If confirmed, Garland will bring extensive background experience in the justice system to his role overseeing the department's more than 110,000 employees -- from serving more than two decades in the federal judiciary to his time as a top DOJ prosecutor during the Clinton administration, overseeing major investigations into the Oklahoma City bombing, Unabomber Ted Kaczynski and the Atlanta Olympics bombings.

-ABC News' Alexander Mallin