Watch President Donald Trump's first post-inauguration interview on ABC this Wednesday

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World News Tonight anchor David Meir asks Trump wide-ranging questions about his presidency in the hour-long primetime special. (ABC)

No questions were off limits in President Donald Trump's first post-inauguration interview, set to air on ABC this Wednesday in an hour-long special. World News Tonight anchor David Muir asked Trump wide-ranging questions about his presidency, including his plan to build a border wall between Mexico and the United States.

"Ultimately, it will come out of what's happening with Mexico ... and we will be in a form reimbursed by Mexico, which I've always said," Trump said in the interview. "I'm just telling you there will be a payment. It will be in a form, perhaps a complicated form. What I'm doing is good for the United States. It's also going to be good for Mexico. We want to have a very stable, very solid Mexico."

Trump was also asked when construction on the wall might begin. "As soon as we can, as soon as we can physically do it," Trump told ABC News. "I would say in months, yeah. I would say in months -- certainly planning is starting immediately."

Watch David Muir's one-on-one interview with President Donald Trump tonight at 10 p.m. ET | 9 p.m. CT on ABC.

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