Here's a roundup of news trending across the nation and world today.

What to know now:

1. The Oscars: In a year where the lack of diversity in nominations led to boycotts of the Academy Awards by some, host Chris Rock agreed that, indeed, Hollywood is racist, just not "that  kind of racist." The comedian's monologue hit both sides of the dispute Sunday night, and Rock continued to revisit the issue throughout the show. As for the big winners, Leonardo DiCaprio won his first Oscar for his role in ""The Revenant," Brie Larson won best actress for "The Room," and "Spotlight," the story of how the Boston Globe uncovered the sex abuse scandal in the Catholic Church, won for best picture.

2. Catholic Church on sex abuse: An advisor to Pope Francis testified Sunday that the Catholic Church "has made enormous mistakes" in its handling  priests who sexually abused children. Australian Cardinal George Pell testified via satellite in front of a commission in Sydney, Australia, that the Church had not delat with the problem for centuries.

3. Pastor shot, killed: A pastor was shot and killed by his brother in a Dayton, Ohio church as services were ending there Sunday. According to witnesses, William Schooler, 70, was in his office when he was shot several  times by his brother, Daniel Schooler, 68. No one else was injured.

4. Trump endorsement: Donald Trump picked up his first endorsement from a sitting senator Sunday when Alabama Republican Jeff Sessions came out in support of the New York businessman's bid for the White House. "The American people are not happy with their government. So some say we should forget it, there is an opportunity this year, Tuesday, the last opportunity we have for the people's voice to be heard. Has the government fixed immigration? Donald Trump will do it," Sessions told a crowd in Huntsville, Ala. "I am pleased to endorse Donald Trump for the presidency of the United States."

5. Another Trump endorsement: Donald  Trump found himself being slammed from all sides Sunday after he said in a CNN interview that he didn't know enough about David Duke to disavow an endorsement by the  former head of the Ku Klux Klan. On Friday,  Trump, after being asked about the endorsement from Duke on Friday, said "All right, I disavow, ok?"  He had said  then he knew nothing about Duke or the endorsement. On Sunday after the CNN interview, Trump tried to clarify his remarks using Twitter.

And one more

A police officer on her first day on the job was shot and killed Saturday by an off-duty Army sergeant stationed at the Pentagon. Ashley Guindon, 28, was  shot as she responded to a call of domestic violence at a home southwest of Washington, D.C. Sgt. Ronald Hamilton, 32, is accused of shooting Guindon and two other officers. His wife was found shot to death in the family's home. The couple's 11-year-old son was unharmed. The two other officers shot were not believed to have life-threatening injuries.

In case you missed it

Here's a bit of Chris Rock's Oscar  monologue. For the complete monologue, click here.