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"Younger Congress men and women are less knee jerk, reactively supporting Israel," she says.

Mr Barker denied he made a "knee jerk decision" to leave the Conservatives.

"Everyone recognizes there is a growing antibiotic resistance crisis, and the knee jerk reaction is to develop new antibiotics," You added.

Unite's deputy regional secretary, Davy Thompson, said minimum service levels are "the most invidious example of knee jerk legislating this country has seen in a long time".

Mr. Berry, a Marine reservist and an attorney, told The Washington Times that the new provision should slow down “knee jerk” reactions from lower-level commanders who receive complaints from “radical activists.”