A United States lawmaker has announced plans to introduce legislation that would prohibit immigration from Somalia, Sudan, and South Sudan, citing national security concerns and instability in the three African nations.

Representative Nancy Mace, a Republican representing South Carolina, unveiled the proposal on June 25, saying the measure is aimed at protecting American communities from potential security threats.

"We will not put the interests of foreign nationals ahead of the safety and security of American citizens," Mace said in a statement.

"No more importing instability. No more ignoring the warning signs. No more apologising for putting our country first. America First. Always."

Mace described Somalia, Sudan, and South Sudan as among the world's "most dangerous and unstable nations," arguing that the United States should avoid immigration policies she claims have contributed to security and social challenges in parts of Europe.

"Americans have watched European cities descend into chaos. Importing people from failed and hostile states has cost lives, destroyed communities, and shattered public trust in government," she said.

"The United States will not make those mistakes. We are stopping it before it's too late."

The proposed legislation aligns with the hardline immigration policies championed by President Donald Trump. During his first term in office, Trump imposed travel restrictions on several majority-Muslim countries, including Somalia and Sudan, citing national security concerns.

Since returning to office, Trump has reiterated his commitment to tightening U.S. immigration policies and has pledged to permanently suspend migration from what he has described as "Third World countries."

As of the time of filing this report, the bill has not yet been formally introduced in the U.S. Congress.