Senate Republicans failed for the third time to advance a bill reversing President Barack Obama's immigration orders as they try to wear down Democratic lawmakers who are unified against it.

The 52-47 vote on Thursday, with 60 required to advance the bill, repeated similar votes held Tuesday and Wednesday.

Republicans are trying to demonstrate to conservative lawmakers in the party that they are exhausting efforts to stop Obama's directives shielding millions of undocumented immigrants in the U.S. from deportation. They're also seeking to pressure Democrats, including West Virginia's Joe Manchin, who has been critical of Obama on immigration, to switch their votes.