Ali denied charges of murder and preparing acts of terrorism during a hearing at London’s Central Criminal Court. He was ordered detained until his trial, due to start March 21.
Amess was 69 and had been a member of Parliament since 1983. His slaying shook a nation accustomed to face-to-face contact with lawmakers, heightened concerns about extremism and rattled British politicians, who say they face increasing levels of vitriol and abuse as they perform their jobs.
The slaying came five years after Labour Party lawmaker Jo Cox was shot and stabbed to death by a far-right extremist. Cox was the first British lawmaker to be killed since a peace accord ended large-scale Northern Ireland violence almost 30 years earlier.