Judgment is being handed down by Mr Justice Ouseley at London's High Court. Whatever the judge decides, appeals against his decisions are almost certain to be taken to the Court of Appeal.
Key accusations include that the Government has unlawfully failed to undertake a strategic environmental assessment of the entire project before giving the go-ahead, or to arrange a consultation process "that allows informed responses on the true merits and demerits of the proposals".
There is also a dispute over the compensation arrangements being put in place for homeowners living near the HS2 line.
Some 172,000 properties within 1km of the first phase are reported to be affected by "a generalised blight" since the proposals were announced.
More top news
The building was once the tallest in Iran's capital and was on fire for several hours before it collapsed.
Vegetable lovers across the UK will be met with possible despair when they attempt to purchase the humble courgette from a supermarket.
Addressing the World Economic Forum, Theresa May said citizens voted for a "truly global Britain" when they opted to leave the EU.