House Republican Conference Chairwoman Elise Stefanik of New York will be giving remarks in the Israeli Knesset on Sunday, according to her office. Stefanik will be the highest-ranking member of the House to visit Israel following the Oct. 7 attack.

Stefanik plans to slam President Joe Biden for recently halting some military aid to Israel, according to excerpts of her speech reviewed by ABC News.

"I have been clear at home, and I will be clear here: There is no excuse for an American president to block aid to Israel," Stefanik will say during the address.

Biden announced the U.S. would withhold certain bomb deliveries to Israel over fear they could be used in Rafah, but the Biden administration informed Congress it's moving forward with more than $1 billion in new arms agreements with Israel.

The congresswoman will address the rise in antisemitism in the U.S., House Republicans' support for Israel and even mention her close ally, former President Donald Trump.

"I have been a leading proponent and partner to President Trump in his historic support for Israeli independence and security," Stefanik will say.

-ABC News' Lauren Peller

Three U.S. medical professionals remain in Gaza despite warnings from the U.S. State Department that the American government may not be able to get them out later.

Tamer Hassan, a registered nurse, Dr. Jomana Al-Hinti and Dr. Adam Hamawy were the only ones out of a group of 20 American medical professionals who stayed behind to help treat patients.

"They understand that the U.S. embassy may not be able to facilitate their departure in the same manner as we have just effected today," a person with knowledge of the situation told ABC News.

Hamawy released a statement Saturday explaining why he stayed behind.

"We worry that the European Hospital we currently are in will suffer a similar fate of Al-Shifa and Nasser hospitals, where humanitarian workers, patients, and civilians were massacred," he said.

"To my wife, daughters and son, I know it hurts that I am not coming home this weekend, and I am sorry. But I know that you are proud that I am upholding my oath to never leave anyone behind," he added.

The doctors who left Gaza "made their way to safety with assistance from the U.S. Embassy in Jerusalem," a State Department spokesman said.

-ABC News' Anne Flaherty, Nadine Shubailat and Zoe Magee

Israeli cabinet minister Benny Gantz has given Israeli Prime Minister Benjamin Netanyahu an ultimatum: approve a post-war plan by June 8, or he will resign, Gantz said at a press conference.

"While the Israeli soldiers show supreme bravery on the front, some of the men who sent them into battle behave with cowardice and irresponsibility," Gantz said.

A leader of the National Unity Party and a minister in the war cabinet, Gantz's resignation would not necessarily trigger the collapse of the government on its own, but would be politically significant.

The ultimatum come on the heels of a speech by defense minister Yoav Gallant, who is demanding a plan for the "day after" the war.

-ABC News' Jordana Miller and Dana Savir

Israel announced that it has identified the body of a fourth hostage this week. Ron Benjamin, 53, was killed during the Oct. 7 Hamas attack and taken into Gaza, according to the Israel Defense Forces.

The bodies of three other hostages were also recovered in a tunnel in the same operation, according to the IDF.

Benjamin was a family man who loved cycling, the Hostages Families Forum said in a statement.

"He used to go out for a ride every Saturday, just as he did on that fateful Saturday when he was taken hostage from the Kibbutz Be’eri area while on a cycling trip," the statement said.

-ABC News' Victoria Beaule

The State Department on Monday said it was aware of reports that U.S. doctors were trapped in Gaza, and that it's been working with Israel to reopen the Rafah gate so U.S. citizens and other foreign nationals can leave.

"I can say that we're aware of these reports of U.S. citizen doctors and medical professionals currently unable to leave Gaza," principal deputy spokesman Vedant Patel said. "As I said before, we don't control this border crossing. And this is a incredibly complex situation that has very serious implications for the safety and security of U.S. citizens. But we're continuing to work around the clock with the government of Israel, with the government of Egypt, to work on this issue."

He added, "Rafah is a conduit for the safe departure of foreign nationals, which is why we continue to want to see it get opened as swiftly as possible."

The State Department said it does not have an estimate of Americans still trapped in Gaza, but that it's helped 1,800 U.S. citizens and legal permanent residents to depart Gaza so far.

"Unfortunately, this is not a border crossing the United States controls but we are continuing to work around the clock with the government of Israel, with the government of Egypt on whatever we can do to make sure that Rafah gets open. … We need to see Rafah open as soon as possible," Patel said.

-ABC News' Anne Flaherty