The prospect of a new toll road relieving pressure on the M4 has reportedly been welcomed by motoring groups.
A spokesman for the AA, while welcoming a relief road, said that charging a toll on the road would “double the injury” for drivers as many would already have paid £6.20 to cross the Severn Bridge.
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It is "clear" ministers cannot proceed with the current Bill, Sir Keir said, threatening to "work with all sides" to ensure revisions.
Rain will clear eastwards through Sunday but it will remain blustery.
Donald Trump has indicated he does not intend to block the release of thousands of secret files about the assassination of John F Kennedy.