Senator Markwayne Mullin, who has been tapped by US President Donald Trump to lead the Department of Homeland Security, will appear on Wednesday in front of a congressional committee.
The Republican lawmaker from Oklahoma will testify before the Senate Homeland Security and Governmental Affairs Committee at 0930 ET (1330 GMT) in Washington.
Trump announced that Mullin will replace DHS Secretary Kristi Noem, who was sacked this month after criticism over her handling of immigration operations in Minnesota.
If the committee votes to proceed with his confirmation, the full Senate will vote later this month where a simple majority of 51-49 is all that is required for him to get the job.
Mullin would take charge of the agency as it strains to tackle a funding impasse which has prompted staff shortages among airport security staff and long queues of airline passengers.
