The academic behind the app which harvested data from 50 million Facebook users said Wednesday he was being used as a scapegoat in the row over online privacy.
Russia hit back at Britain in the spy poisoning row, demanding proof of its alleged involvement in a nerve agent attack, as international weapons experts arrived to take samples of the toxic substance.
The chairman of parliament's Digital, Culture, Media and Sport Committee also alleged that Cambridge Analytica Chief Executive Alexander Nix had "deliberately misled" his committee.
International chemical weapons experts were due to arrive in Britain Monday to collect samples of a nerve agent used to poison a former Russian spy as London accused Moscow of stockpiling the toxin used in the attack.
Britain has said Russia used the Soviet-era nerve agent called Novichok to attack Sergei Skripal and his daughter Yulia in the first known offensive use of such a weapon on European soil since World War Two.
A fresh bout of snow on Saturday forced the cancellation of more than 100 flights in and out of London's Heathrow Airport, with a bad forecast threatening further disruption.
Russia's Investigative Committee said on Friday it had opened a criminal investigation into the attempted murder of Yulia Skripal, daughter of former double agent Sergei Skripal, and what it said was the attempted murder of another Russian in Britain.
"France shares Britain's assessment that there is no other plausible explanation and reiterates its solidarity with his ally," Macron's office said.
France on Wednesday said it wanted firm proof of Russian involvement in the nerve-toxin poisoning of a Russian double agent in Britain before it took any action in solidarity with the British government.