President Barack Obama says the US should take military action against Syria and he will seek congressional authorisation for strikes. Obama sent a letter to the heads of the House and Senate on Saturday night, hours after announcing that he believes military action against Syrian targets is the right step to take over the alleged use of chemical weapons.
The US says the Syrian government carried out chemical weapons attacks on 21 August in which 1,429 people died including 426 children.
UN inspectors who have been investigating the attacks arrived in the Netherlands on Saturday with samples from site visits, which will be tested in laboratories in Europe.
France will wait for discussions in the US Congress and French parliament before making a decision on military intervention.
Obama has the authority to act without Congress, even if Congress rejects his request for authorization to use force.