His confirmation could be among the most difficult the Senate undertakes. Senate Democratic leaders had to discharge President Joe Biden’s Health and Human Services Secretary Xavier Becerra this month after a tie committee vote. But Becerra was ultimately confirmed with the support of one Republican, Sen. Susan Collins of Maine, averting the need to lean on Harris to break a tie.
Kahl, a former Pentagon Middle East policy official and national security adviser to then-Vice President Biden, has been easily the most contentious of the three of Biden Pentagon nominees Armed Services has considered so far.
A planned committee vote on Kahl had been delayed for nearly two weeks as centrist Democrat Joe Manchin of West Virginia, seen as the swing vote in committee and likely on the floor, remained publicly undecided. Defense Secretary Lloyd Austin intervened on Kahl’s behalf, urging Manchin to support him.
At a confirmation hearing in early March, Kahl came under fire from Republican senators for his past tweets criticizing GOP lawmakers and former President Donald Trump’s national security policies.
A similar controversy over harsh tweets ultimately helped tank the nomination of Biden’s pick to lead the White House budget office, Neera Tanden.
GOP senators, led by Armed Services ranking member Jim Inhofe of Oklahoma, have lined up in opposition to Kahl in the weeks since his confirmation hearing.
“This position demands bipartisanship, even temperament and good policy judgment — characteristics I don’t believe Dr. Kahl has demonstrated,” Inhofe said in a statement.
Republicans have also parted ways with Kahl on some policy areas, including his vocal advocacy for the 2015 agreement to rein in Iran’s nuclear program.
Democrats have largely backed him and extolled his qualifications for the top policy job. Allies in the national security and foreign policy world also came to his defense last week, arguing in a letter to Inhofe and Senate Armed Services Chair Jack Reed (D-R.I.) that Kahl has been the target of a “smear campaign” and that his nomination is being used to relitigate the Iran deal.
Still, Democrats must hold the line with a narrow road to his confirmation. Some Democratic senators, such as moderate Kyrsten Sinema of Arizona, could still defect on a final vote. Other senators to watch include Foreign Relations Chair Bob Menendez (D-N.J.), who opposed the Iran nuclear agreement.
But Republican support for Kahl is increasingly less likely. Collins, who has broken with her party to support some of Biden’s nominees, announced last week she won’t support Kahl on the Senate floor.