Trump has approved a Pentagon request to allow more aggressive airstrikes against extremist group al-Shabab as parts of southern Somalia will be considered areas of active hostilities.
US special operations forces can move closer to the fight and call in offensive airstrikes more quickly while increasing assistance to the Somali National Army.
Some in long-chaotic Somalia, where access to independent information is extremely challenging, could see this as a chance to spread misinformation, said Laetitia Bader, a Somalia researcher for Human Rights Watch.
Somalia's fragile central government, which struggles to assert itself beyond the capital and other limited areas, has not yet commented on Trump's decision. The country also was one of the seven predominantly Muslim countries included in Trump's recent travel ban that has been suspended by federal courts.
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Somalia's government has declared the growing drought a national disaster, with the UN saying roughly half of the country's 12 million people are at risk. A cholera outbreak also spreads. More than a quarter-million people have been displaced in recent months, the UN refugee agency says, as drought-stricken families try to reach points where aid agencies are distributing food.
The extremist group has promoted its own drought relief efforts, but they are seen as attempts to keep civilians from leaving areas under their control.