The Chinese telecoms firm Huawei is suing the United States for excluding it from government contracts.
The firm argues a law passed last year is unconstitutional.
In a statement on Thursday, the company said it had filed a lawsuit in the district court in Texas, calling for the ban to be overturned.
From Washington, Daniel Ryntjes reports:
US military says it turned away blockade runner trying to reach Iranian port
The US military has announced that it fired a missile into the engine room of a vessel trying to get through the US blockade of Iran on Friday.
WHO chief urges safe burials in visit to heart of Ebola outbreak
The World Health Organisation (WHO) chief has travelled on Saturday to the Congolese province hardest hit by an Ebola outbreak, urging residents to seek treatment and practice safe burials as officials scramble to contain the fatal disease.
Rescuers pull four from flooded cave in Laos
Rescuers pulled four people from a flooded cave in Laos on Saturday, Thai volunteers said, hours after another man was brought out late on Friday.
Brazil investigates suspected Ebola case in Sao Paulo
Health authorities in Brazil's Sao Paulo state are investigating a suspected case of Ebola reported on Saturday in the state capital, officials said.
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