Mark Matthews Talks to ABC News on Trump Tax Investigation

Since the launch of his presidential bid, Donald Trump's political opponents have tried -- and failed -- to obtain his tax returns.

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"It's going to be a long slog," said Mark E. Matthews, an attorney in private practice at the Washington firm Caplin & Drysdale who once served as the head of the IRS Criminal Investigation Division, "to get to the meat of this."

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There are likely separate filings dealing with any foreign holdings and gifts he gave and received, Matthews said. The nature of Trump's business suggests there will be filings related to licensing income, intellectual property issues and, of course, he said, Trump's vast real estate holdings.

"They're going to really need someone who knows the real estate world," Matthews said. "That is a quagmire. It's always a nest of partnerships and limited liability corporations. ... They will need to bring in experts."

One of them could come from within the Trump Organization.

For the full article, please visit ABC News' website.

Excerpt taken from the article “While Democrats Plot Probe into Trump’s Tax Returns, Republicans Prepare for Battle” by Matthew Mosk for ABC News.