The National Review, once a bible of the American right, on Thursday published an entire issue dedicated to attacking Donald Trump, the clear national front runner for the Republican nomination. Here are some of the views expressed by conservative commentators in the "symposium" on Mr Trump.
Trump would 'love' to compete against Bloomberg
Speaking on CBS' Face the Nation, US Republican presidential candidate Donald Trump says he would love former New York City mayor Michael Bloomberg to enter the race for the White House.
"Trump's potential primary victory would provide Hillary Clinton with the easiest imaginable path to the White House."
Glenn Beck, radio host
"We should not put a new conservative in charge of conservatism or the country, so that he does not become puffed up with conceit and fall into condemnation."
Erick Erickson, editor of The Resurgent and an Atlanta-based talk-radio host
"Trump might be the greatest charlatan of them all."
L. Brent Bozell III, chairman of For America and the president of the Media Research Centre. He has endorsed Ted Cruz for president.
"He has like a tapeworm invaded the schismatically weakened body of the Republican party."
Mark Helprin, novelist
"He doesn't know the Constitution, history, law, political philosophy, nuclear strategy, diplomacy, defense, economics beyond real estate, or even, despite his low-level-mafioso comportment, how ordinary people live."
Mark Helprin, novelist
"Isn't Trumpism a two-bit Caesarism of a kind that American conservatives have always disdained? Isn't the task of conservatives today to stand athwart Trumpism, yelling Stop?"
William Kristol, editor of The Weekly Standard
"Trump's brawling, blustery, mean-spirited public persona serves to associate conservatives with all the negative stereotypes that liberals have for decades attached to their opponents on the right."
Michael Medved, conservative radio host
"Donald Trump, a political con man who sympathises with hit man Vladimir Putin."
Mona Charen, senior fellow at the Ethics and Public Policy Centre
"Trump has made a living out of preying on and bullying society's most vulnerable, with the help of government. He isn't an outsider, but rather an unelected politician of the worst kind."
Katie Pavlich, editor of Townhall
"Trump is an unbalanced force. He is the politicised American id."
John Podhoretz, editor of Commentary
"Our nation's solidarity is being tested. It will only make things worse if we go Trumpster diving."
R.R. Reno, editor of First Things
"A shoot-from-the-hip, bombastic show-off is the last thing we need or can afford."
Thomas Sowell, a senior fellow at the Hoover Institution