Attorney General Brian E. Frosh (Katherine Frey/The Washington Post)

Maryland Attorney General Brian E. Frosh (D) said Friday that Maryland plans to join Washington in its lawsuit against President Trump’s travel ban, the first legal action by Frosh since the General Assembly gave him authority to sue the federal government.

Frosh called the ban “unwise, illegal and un-American” and said it makes the country “less safe, not more safe.”

“President Trump’s second executive order is still a Muslim ban,” Frosh said in a statement. “It makes us less competitive and sends a message to the most talented academics, scientists and engineers around the world that they are not welcome. It will harm Maryland’s universities and our economy.”

The decision by Frosh comes less than a month after the Maryland General Assembly empowered him to sue the federal government without first having to get permission from the governor.

The General Assembly approved the resolution after the attorney general sent a Feb. 1 letter to Gov. Larry Hogan (R) asking for permission to take legal action against Trump’s controversial entry ban but never received an answer.

Raquel M. Coombs, a spokeswoman for Frosh, said Maryland is one of at least five states that will formally join Washington in the lawsuit. The lawsuit is expected to be amended on Monday.