Senators had asked for findings by Friday on culpability of Saudi royal family; new legislation would demand sanctions on those found responsible.
The president told diplomats from more than 70 countries that the militants remain a threat, while Secretary of State Mike Pompeo said the United States will continue to lead even after its troops withdraw from Syria.
In his State of the Union address, the president broke little new ground on his foreign-policy priorities.
Ashraf Ghani’s government remains suspicious of the Trump administration’s talks with the militants.
Ilham Ahmed had an impromptu meeting with President Trump at his Washington hotel. “I love the Kurds,” she said the president told her.
U.S.-based Citgo and oil refiner Valero will be able to continue importing crude as long as payments do not go to the Maduro government.
The issue is especially potent in Florida, a must-win state for the president’s 2020 reelection effort.
The action could deprive President Nicolás Maduro of vital cash.
U.S. officials have refused to rule out military action or far-reaching economic measures.
The incident marks one of a limited number of times in which the United States has struck out directly at forces loyal to Syrian President Bashar al-Assad.