Venezuela’s two presidents are going head-to-head again. The current issue is not a new situation necessarily, but things seem to be heating up.

President Nicolas Maduro, Venezuela’s long-standing president who was recently reelected during elections that are widely believed to be fraudulent, is holding humanitarian aid for his country at the border. He won’t let the aid enter because he says it’s part of an American ploy to overthrow him and that things aren’t that bad in Venezuela anyway.

Self-proclaimed Interim President Juan Guaido says that the aid will be coming in and it will be soon. He gave military leaders who are Maduro’s staunchest remaining supporters until Saturday to switch sides and allow aid to enter the country. What will happen if the Saturday deadline isn’t met is unclear. Guaido has attempted to give military leaders cover for switching sides, promising amnesty to any who do.

Pressure on Maduro continues to mount as more and more countries recognize the government of Guaido. And despite Maduro’s insistence that things in Venezuela aren’t that bad, the average people can see for themselves; refugees from the country arriving in Colombia and Brazil paint a distinctly desperate situation within the country.

Meanwhile, President Donald Trump has refused to take the option of military intervention off the table. While U.S. military intervention on a large scale is unlikely, the threat is enough to give all parties pause. What is already a volatile situation has the potential of becoming explosive.