ABC:

During his speech to the United Nations General Assembly, President Donald Trump called on Iran to release all Americans being detained by the regime and its Revolutionary Guard Corps.

Among those Americans held are a father and son -- Baquer and Siamak Namazi -- and their family is urging Trump to take "urgent action" to bring the two home.

Siamak Namazi was been held since October 2015. A Dubai-based businessman, he was detained while visiting relatives and sentenced for "cooperating with Iran's enemies." His father, Baquer Namazi, an 81-year-old retired UNICEF official, was detained in February 2016 as he worked to free his son; instead, he was tried and received the same guilty verdict.

Both are being held at the notorious Evin Prison, where they've faced solitary confinement and other harsh treatment.

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