WASHINGTON, DC — Attendees at a protest Thursday expressed frustration over former U.S. President Barack Obama’s failure to close the Guantánamo Bay prison, which he promised to do on the first day of his presidency. The protesters also denounced President Donald Trump. An imam calling for Gitmo, as the facility is commonly known, to be shut down also urged authorities to detain U.S. President Donald Trump in a similar facility for refusing to give into the demonstrator’s demands. Many demonstrators placed the blame on the fairly new U.S. President Donald Trump for keeping the detention center, ignoring his predecessor’s eight...