Debilitating morale problems that have plagued DHS for years worsened since Johnson took over in December, according to a survey.
September marked the third consecutive month that the numbers declined, according to Homeland Security chief Jeh Johnson.
Congressmen teamed to call for a far broader investigation of the Secret Service than Homeland Security has promised.
Congressional aides from both parties have said in recent days that they are hoping to reach agreement on a comprehensive cyber bill that could be voted on after the election.
He said DHS is working to address the threat with outreach to steer people away from radical groups and ideologies.
The attorney general, who became an icon to liberals but a divisive figure to many conservatives, will step down once a successor is confirmed.
The byzantine system involving dozens of committees and commissions “makes no sense at all,” said Rep. Peter King (R-N.Y.)
Many people in homeland-security circles question the idea of a single department composed of automonous agencies with clashing work cultures.
High turnover among Homeland Security leaders is a result of what employees describe as a dysfunctional work environment, abysmal morale and the lure of private firms paying top dollar.
Auditors warn of more cost overruns, missed deadlines for Homeland Security’s office complex in D.C.