Nearly all Welsh MPs voted to halt Boris Johnson's plans to get his Brexit deal through in three days.
Tuesday marked the first time parliamentarians voted in favour of any Brexit deal in principle, but crucially MPs rejected the proposed three-day timetable to debate it.
Boris Johnson has said the Government will “pause” its Brexit bill until the EU reaches a decision on an extension.
The Prime Minister had the backing of all Welsh Conservative MPs.
Speaking after the vote, Clwyd West MP David Jones blamed the opposition for ''scuppering'' Johnson's plans and said it risked a no-deal Brexit.
All of Plaid Cymru's MPs and Welsh Labour MPs voted against the timetable.
Plaid MP Jonathan Edwards said the UK Government's timetable defeat is a ''victory for democracy''.
Welsh Liberal Democrat Leader, Jane Dodds, and former Conservative MP Guto Bebb also voted against the timetable.
Earlier on Tuesday, the Welsh Assembly voted to show they do not support the UK Government's Withdrawal Bill.
First Minister Mark Drakeford said it was a ''bad deal for Wales.''
Drakeford will meet Scotland's First Minister Nicola Sturgeon on Wednesday where they will jointly voice their opposition to the Brexit deal.