Sen. Marco Rubio (R-FL) Getty Images

Five Republican senators have asked the Trump administration to suspend talks to transfer U.S. nuclear technology to Saudi Arabia following the killing of journalist Jamal Khashoggi at the kingdom's consulate in Turkey. The lawmakers, led by Senator Marco Rubio, threatened to block any agreement to export civilian nuclear technology to Saudi Arabia, potentially setting up a showdown with the White House. The Trump administration has courted the Saudis as they seek to build 16 nuclear power reactors over the next 25 years, an endeavor that would generate tens of billions of dollars in economic activity. In a letter to President Donald Trump, the senators say the slaying of Khashoggi, as well as other foreign policy issues, raise questions about whether the Saudi leadership should be entrusted with U.S. nuclear technology and know-how. "The ongoing revelations about the murder of Saudi journalist Jamal Khashoggi, as well as certain Saudi actions related to Yemen and Lebanon, have raised further serious concerns about the transparency, accountability, and judgment of current decisionmakers in Saudi Arabia," the lawmakers wrote in a letter to Trump. "We therefore request that you suspend any related negotiations for a U.S.-Saudi civil nuclear agreement for the foreseeable future."

The letter was also signed by Cory Gardner of Colorado, Dean Heller of Nevada, Rand Paul of Kentucky and Todd Young of Indiana. Rubio, Young, and Gardner were part of a bipartisan group of senators that earlier asked the administration to start an investigation into Khashoggi's death and determine whether the United States should impose human rights sanctions on Saudi individuals. A Saudi prosecutor said for the first time last week that agents of the kingdom planned Khashoggi's killing, after initially determining the Washington Post columnist and U.S. resident died during a physical altercation with the operatives. Prior to that, the Saudi government claimed Khashoggi left the consulate in Istanbul unharmed. Prominent Republican lawmakers have stated publicly that they think Saudi Arabia's Crown Prince Mohammed bin Salman — the nation's king-in-waiting and a close ally of the Trump administration — orchestrated the killing. U.S. intelligence officials reportedly believe Prince Mohammed is culpable in Khashoggi's death. In the letter to Trump, the five senators say they have long had reservations about selling nuclear technology to Saudi Arabia. They note the Saudis have balked at a provision in U.S. nuclear cooperation agreements aimed at preventing the spread of nuclear weapons.