Overnight President Donald Trump ordered the suspension of the green card lottery, which allows up to 50 thousand people into the US through a random selection process.
He says it's necessary because that's how the suspect in a mass shooting at Brown University entered the country.
In other developments this week he ordered "a total and complete" blockade of all sanctioned oil tankers entering and leaving Venezuela.
In recent months, the US military has attacked 26 vessels, allegedly smuggling drugs.
Our US correspondent Simon Marks joins Susie Ferguson live from Washington.
US President Donald Trump Photo: DOUG MILLS / AFP
