First of all, Mr. Trump, congratulations on a historical, political victory. You have done what most considered impossible. You have taken on some of the greatest, most skilled politicians in the Republican Party and defeated them in detail. But now, as the cliché says, comes the hard part.

As you prepare for the general election campaign and the task of taking apart Hillary Clinton, you have to recognize the hard truth that you have a divided Republican Party to unite. Many – even most – Republicans think you are temperamentally and politically unsuited for the presidency. Your task is to convince them otherwise. To do that, you are going to have to cultivate qualities that are frankly hard for you, chief among them is humility.

The first thing you have to do is to reach out to the last real threat to your nomination, Sen. Ted Cruz. Wait a week or so to allow for angry feelings to subside and then request a private meeting.

At the meeting, start out by apologizing. You need to apologize not only for the “Lyin’ Ted” jibes but for the insults to Ms. Cruz and the wild conspiracy theory concerning the senator’s father. The apology cannot be in the mode of “it was not personal, strictly business.” You need to admit that your attacks stem from a character flaw you possess. The Cruzes are devout Christians and will appreciate that kind of confession and will offer forgiveness if you are sincere.

Then you need to ask Cruz for advice. The senator is a smart person, tough and competitive as you mentioned in your gracious victory speech.

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He will have a lot of good things to impart, not only about policy but politics.

Finally, you need to offer Cruz something. A position on the campaign as an advisor is a given. But Cruz would probably be open for a position in your administration. Vice presidential running mate would be an idea, a signal that you are reaching out to conservatives. As an alternative, you could offer him a seat on the Supreme Court. Cruz would probably like that. As a president, he would have only eight years at most to influence the direction of the country. As a Supreme Court justice, he would have 40 years and more to shape how the United States is governed. The prospect would be very appealing.