Conservative Party Chairman Grant Shapps told the party conference defecting Mark Reckless has "abused" their trust.
"Today your trust has been abused, you have been cheated, but worse, the people of Rochester and have been cast aside," Shapps said.
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Stephen Barclay says Mr Tusk is clearly opposed to Brexit.
It is the start of the couple’s third tour to the country.
He said this means voters can be certain his party will deliver Brexit.