WASHINGTON—U.S. officials sent to Haiti by President Joe Biden’s administration in the wake of the assassination of its president met with three politicians who have all staked claims to lead Haiti’s government, the White House said on Monday. Representatives of the White House National Security Council and the departments of Homeland Security, Justice and State traveled to Haiti in response to Haiti’s request for security and investigative assistance after the slaying of Haitian President Jovenel Moise. Emily Horne, a spokesperson for the National Security Council, said the delegation met on Sunday with Acting Prime Minister Claude Joseph and Prime Minister-Designate Ariel Henry in a joint meeting, as well as Senate President Joseph Lambert. In her statement on Monday, Horne said the U.S. representatives encouraged open and constructive dialogue to reach an agreement to enable Haiti to hold free and fair elections. White House Press Secretary Jen Psaki said on Monday …