President-elect Joe Biden’s choices on whom to appoint for Cabinet positions and other personnel will be the first “real test” of whether he will deliver for liberal climate activists who were initially reluctant to back him in the campaign.

Liberal activists are keeping pressure on Biden not to appoint Obama-era centrists with ties to the oil and gas industry to his administration even as he faces the challenge of getting his appointees approved through a Senate run by Mitch McConnell if Republicans maintain control.