This time, it's not a new executive order but a presidential proclamation that has caused a worldwide stir. The policy signed by US President Donald Trump on Wednesday is entitled "Restricting the Entry of Foreign Nationals to Protect the United States from Foreign Terrorists and Other National Security and Public Safety Threats" and takes effect on June 9.

Like executive orders, presidential proclamations are one of the instruments with which a US president can implement the administration's will, particularly regarding national security and immigration.

Unlike laws, these documents do not require the approval of Congress. However, they must be based on powers granted by law. In terms of content, Trump's new proclamation ties in with previous travel bans imposed during his first term as president, which the Supreme Court upheld in 2018.

The proclamation bans entry to the US for all nationals from

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