Donald Trump may have to wait for any pressure on Venezuela's President Nicolas Maduro to pay off, a former US ambassador to Venezuela says.
Charles Shapiro tells presenter Mark Austin that ships flying the flag of a country where they are not registered and in international waters can be stopped by the navy of any nation.
The US had a judge order to seize the first Venezuelan-linked vessel but didn't for the second one that was taken on Saturday, he says, while the case of the third ship currently being chase is unclear.
Asked if the US interceptions of oil tankers will have a real impact, Shapiro says: "It'll have an impact but it will take time, and that's what the Trump administration is up against.
"Clearly they're trying to pressure Maduro out of office, and the president's got a menu of options to turn up the heat on Maduro to increase the pressure, and this is one of them.
"I can't tell you what will be next, but this will be slow. It's not going to be something that'll turn Maduro around overnight, and that's going to complicate things for Donald Trump."
Watch Shapiro's interview here...