WASHINGTON (AP) — President Donald Trump demanded answers Wednesday from Saudi Arabia about the fate of a missing Saudi writer as lawmakers pushed for sanctions and a top Republican said the man was likely killed after entering a Saudi consulate in Turkey.

Trump said he didn’t know what happened to Jamal Khashoggi and expressed hope that the 59-year-old writer, who went missing a week ago, was still alive. But senior members of Congress with access to U.S. intelligence reporting feared the worst.

More than 20 Republican and Democratic senators instructed Trump to order an investigation into Khashoggi’s disappearance under legislation that authorizes imposition of sanctions for perpetrators of extrajudicial killings, torture or other gross human rights violations.

While no suspects were named, and the lawmakers’ letter to the president is only a preliminary step toward taking punitive action, it marked a departure from decades of close U.S.-Saudi relations that have only intensified under Trump. Riyadh has supported the administration’s tough stance toward Iran, a key rival of Saudi Arabia in the volatile Middle East.

Republican Sen. Bob Corker, who as chairman of the Senate Foreign Relations Committee has reviewed the U.S. intelligence into what happened to Khashoggi, said “the likelihood is he was killed on the day he walked into the consulate.” He said that “there was Saudi involvement” in whatever happened with the journalist, who wrote columns for The Washington Post.

“The Saudis have a lot of explaining to do because all indications are that they have been involved at minimum with his disappearance,” Corker told The Associated Press. “Everything points to them.”

Khashoggi, a wealthy former government insider who had been living in the U.S. in self-imposed exile, had gone to the consulate in Istanbul on Oct. 2 to get paperwork he needed for his upcoming marriage while his Turkish fiancee waited outside.

Turkish authorities have said he was killed by members of an elite Saudi “assassination squad,” an allegation the Saudi government has dismissed.

The Washington Post reported Wednesday evening that U.S. intelligence intercepts outlined a Saudi plan to detain Khashoggi. The Post, citing anonymous U.S. officials familiar with the intelligence, said Saudi Crown Prince Mohammed bin Salman ordered an operation to lure Jamal Khashoggi from his home in Virginia to Saudi Arabia and then detain him.

Trump told reporters in the Oval Office that he has a call in to Khashoggi’s fiancee, Hatice Cengiz, who has appealed to the president and first lady Melania Trump for help.

Trump said he had spoken with the Saudis about what he called a “bad situation,” but he did not disclose details of his conversations. He also said the U.S. was working “very closely” with Turkey, “and I think we’ll get to the bottom of it.”

White House press secretary Sarah Huckabee Sanders said national security adviser John Bolton and presidential senior adviser Jared Kushner spoke Tuesday to Crown Prince Mohammed about Khashoggi.