CUCUTA, Colombia — Venezuelan doctors protested Sunday at the entrance to a bridge blocked by their nation’s military to demand that humanitarian aid be allowed to enter, as opposition leader Juan Guaido acknowledged the conflict over the food and supplies could lead to clashes.

The doctors protested on the Colombia side of the border, saying they would face repercussions for holding a similar demonstration on the Venezuelan side.

Dr. Katia Diaz, a psychiatrist, said that each day aid sits waiting for transport into Venezuela represents one more day in which patient lives are at risk.

Guaido, the leader of the National Assembly who four dozen nations are recognizing as Venezuela’s rightful president, urged the military to think carefully about how they will proceed. Attending a church service Sunday with his family, he recognized that the feud between those who do and do not want the aid to be let in could lead to problems.

President Nicolas Maduro has vowed not to let the supplies pass, saying Venezuela isn’t a nation of beggars. He contends the food, hygiene kits and emergency medical gear are part of a larger ploy by the United States to remove him from power.

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