US set to deport permanent residents over alleged support to Haitian gang leaders

[FormerOstrich]

10. What is the authority dertermining justification to deport permanent residents?

Is this a decision Rubio makes on his own? Or, was there some sort of court authorization. I can't tell from the articles. I have added emphases below:

WASHINGTON, July 21 (Reuters) - U.S. Secretary of State Marco Rubio on Monday paved the way for the United States to deport certain lawful permanent residents, saying Washington determined some had supported Haitian gang leaders connected to a U.S.-designated "terrorist" organization.
.....
Following the determination, the Department of Homeland Security can pursue the deportation of the lawful permanent residents, also known as green-card holders, Rubio added. It was unclear how many people could be targeted for deportation, and no individuals were named in his statement.

The implication is Homeland Security did not have authority until a "determination" was obtained. Was/Is that the sole decision of Rubio? Is it in his scope of work to do so?