Donald Trump’s speech on national security, which he delivered the day after the terrorist attack in Orlando, Florida, will change the dynamic of this election.

The speech was specific, detailed, and on the money. Trump showed how strategic securing the border is, how important stopping immigration from terror zones like Syria is, and how deadly political correctness has become. Political correctness – which transforms the Islamic world, which has a lot to answer for, from aggressors into innocent victims – functions as a shield for Islamic terrorists, and handcuffs law-abiding citizens prompting them not to report suspicious activities by Muslims for fear of being called racist.

Trump was especially courageous (and politically incorrect) in pointing out that the Muslim communities in which the terrorists operate know what is going on but don’t say anything. What a contrast with Hillary’s speech today, which focused on reinforcing political correctness – attacking so-called assault rifles, as though guns and not fanatics were the problem, and emphasizing the importance of not alienating Muslims by acknowledging that a large and growing segment of the Islamic world is at war with us. What contempt for Muslims who are also victims of Islamic terror!

Does denying reality encourage non-belligerent Muslims to help us? For seven and a half years, the Obama administration has closed its eyes to the Islamic dimensions of the terrorist threat, has refused as long and as much as possible to even use the word “terror.” And what has been the result? Muslims in San Bernardino and St. Lucie – as Trump had the political courage to point out – saw something but said nothing about the atrocities brewing in their communities.

At the same time, the progressive enablers of Islamist terror have been busy blaming Christian conservatives for the anti-gay hatred that is a core belief of the Islamists, rooted not only in their religious texts but relentlessly broadcast through their Imams and mosques.

Donald Trump has shown how dangerous and deadly the PC orthodoxy of the political left is. He has laid out the practical steps that are absolutely necessary to protect Americans but have been missing during the seven and half years of Obama’s appeasement administration. And – it should be said – that have been missing from critiques of Obama by Republicans fearful of being politically incorrect.

The Republican outcries against Trump’s call for a moratorium on Muslim immigration from terror zones are disgraceful and dangerous. The attacks by Republican renegades on Trump as a “trickle down racist” are disgusting and dangerous. They serve only one purpose, which is to cripple the only candidate in this presidential race who will actually defend this country and not facilitate its dismantling and destruction.

David Horowitz is the author of Progressive Racism.