In a letter to Senate leaders, American Trucking Associations President Chris Spear expressed concern about the track record that Labor Secretary nominee Julie Su would bring to the job.

President Joe Biden recently nominated Julie Su to serve as the next secretary of the Department of Labor.

WASHINGTON — President Joe Biden on Feb. 28 said he planned to nominate Julie Su, the current deputy, as his next labor secretary, replacing the departing incumbent, former Boston Mayor Marty Walsh.