John Dickinson, one of the lawyers representing the Iraqis in the al-Sweady case, said the inquiry has taken so long to set up, because it was "vigorously opposed" by the MOD.
More than three years after it was ordered, the inquiry will examine claims that UK soldiers murdered 20 or more Iraqis, and tortured detainees in Maysan Province, southern Iraq, in May 2004.
More top news
Defence Secretary James Mattis has distanced himself from Mr Trump's assessment of the media, as has Republican senator John McCain.
A two-year-old boy was found dead in a Perthshire river after being reported missing on Sunday morning.
Eagle-eyed Twitter users spotted that a campaign photo the party claimed was in Stoke on Trent, was actually in Bolton.