At least five people are dead and dozens more injured after the derailment near the city of Cordoba.
Europe is split between hitting back at Trump's tariff threat or holding fire to avoid a damaging trade war.
The troops are an option should Donald Trump decide to use them to quell anti-ICE protests in the city, an official tells CBS News.
The US president threatens to impose tariffs on countries that oppose his plans to take over the territory.
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