Reports say Theresa May is expected to face MPs’ questions about her decision to authorise air strikes against the Syrian government.
Opposition parties say MPs should have been consulted before the UK joined the US and France in bombing three Syrian sites, in response to a suspected chemical attack on the town of Douma.
Labour has called for the law to be changed for any future interventions.
Foreign Secretary Boris Johnson promised MPs would have “abundant time” to have their say.
Sites near Damascus and Homs were hit on Saturday in response to the alleged chemical attack on Douma on 7 April.
Both Syria, which denies any chemical use, and Russia, which provides military support to the Syrian government, have reacted angrily to the action.
UK prime ministers do not legally need to consult Parliament before launching military action, although they have done so since the 2003 invasion of Iraq.
Mrs May is due to give a Commons statement today before facing questions from MPs.
She is also expected to ask the Speaker for permission to hold an emergency debate in Parliament on the issue of Syria.