Sen. Josh Hawley (R-Mo.) announced on Tuesday he would place a hold on Alejandro Mayorkas, President-elect Joe Biden’s choice to lead the Department of Homeland Security (DHS).

Hawley, who has come under fire recently amid allegations that he played a role in the Capitol riot early this month, made the announcement just hours after the Senate Committee on Homeland Security and Governmental Affairs wrapped its hearing with Mayorkas. The move delays the nomination of a post Democrats have argued is critical to fill immediately in order to protect national security.

“Mr. Mayorkas has not adequately explained how he will enforce federal law and secure the southern border given President-elect Biden’s promise to roll back major enforcement and security measures,” Hawley said in a statement.

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“Just today, he declined to say he would enforce the laws Congress has already passed to secure the border wall system. Given this, I cannot consent to skip the standard vetting process and fast-track this nomination when so many questions remain unanswered."

Hawley’s opposition comes as Biden and Democrats argue the attacks on the Capitol make the post a top priority. Hawley was the first senator to announce he would vote against certification of the 2020 election results.