McMillan-Scott claimed the grouping's Polish leader Michal Kaminski has had "anti-Semitic, homophobic and racist links," charges he denies.
He angered the Conservative leadership in July by standing for one of the European Parliament's vice president posts, ruining an apparent deal in which Kaminski would be backed for the job.
McMillan-Scott said he would appeal the expulsion decision, adding that he would not be made a "scapegoat" for widespread criticism of the Conservatives for forming the new alliance.
"After 42 years in the party, 25 as an MEP and four years as Leader of the MEPs the party should trust me not to make political mistakes," he said in a statement, confirming the expulsion.
Conservatives leader David Cameron, widely tipped to win a general election in Britain within nine months, pulled his MEPs from the centre-right European People's Party after elections in June, deeming it to be too EU-friendly.
The new European Conservatives and Reformist Group (ECR) wants to see decision-making powers concentrated more in the member states and less in Brussels.
With 54 MEPs signed up from eight countries, the ECR is the fifth largest group in the 736-seat European legislature.
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He angered the Conservative leadership in July by standing for one of the European Parliament's vice president posts, ruining an apparent deal in which Kaminski would be backed for the job.
McMillan-Scott said he would appeal the expulsion decision, adding that he would not be made a "scapegoat" for widespread criticism of the Conservatives for forming the new alliance.
"After 42 years in the party, 25 as an MEP and four years as Leader of the MEPs the party should trust me not to make political mistakes," he said in a statement, confirming the expulsion.
Conservatives leader David Cameron, widely tipped to win a general election in Britain within nine months, pulled his MEPs from the centre-right European People's Party after elections in June, deeming it to be too EU-friendly.
The new European Conservatives and Reformist Group (ECR) wants to see decision-making powers concentrated more in the member states and less in Brussels.
With 54 MEPs signed up from eight countries, the ECR is the fifth largest group in the 736-seat European legislature.
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