The U.S. Senate confirmed Kirstjen Nielsen as secretary of homeland security on a 62 to 37 vote Tuesday.
Part of her responsibilities will include hiring 15,000 new agents for Immigration and Customs Enforcement and Border Patrol, an agency that reportedly sees quick turnover among its employees.
Kirstjen Nielsen is now an aide to White House chief of staff John Kelly, who served as Trump's first homeland secretary.
Kirstjen Nielsen, a top White House aide considered to be a cybersecurity expert, will now lead the DHS.
The newly confirmed secretary also pledged during her confirmation hearing to continue implementing Trump's aggressive immigration agenda.
Nielsen's "work in and around the department since its creation, as well as her knowledge of cybersecurity, risk management and critical infrastructure, should serve her well in confronting the daunting threats to our homeland", said Sen.
Kirstjen Nielsen was confirmed by the U.S. Senate to helm the department.
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Senate Homeland Security Chairman Ron Johnson, R-Wis., said Nielsen brings valuable, practical experience to DHS. Though no GOP senator voted against her, the outcome reflected intense opposition to Trump as well as doubts about Nielsen's executive leadership experience and willingness to challenge the White House in the event of a disagreement.
Elaine C. Duke, a deputy Homeland Security secretary, has served as the acting secretary in the interim. Several administration officials say Duke has informed the White House she plans to resign once Nielsen takes over. "Throughout her confirmation process, Ms. Nielsen failed to demonstrate that she would provide the steady, experienced leadership - free from political interference from the White House - that the department needs".
"She has equivocated on protecting Dreamers and overlooked reports of DHS' management failures", Harris said.
Homeland Security oversees the nation's borders, cybersecurity and response to natural disasters, among other areas. No Republicans opposed her nomination.
Nielsen, 45, is a lawyer and veteran of the national security sector.
But in her short tenure, the new sheriff's No. 2 has already helped set a new tone in the West Wing that was described by more than 10 senior administration officials and outside advisers to the president as one that can be dismissive and lacking in collegiality.