Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE is suggesting Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) might not want the Republican presidential nominee to win in 2016 because Ryan may want to launch his own White House bid in four years.

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"I don't want to be knocking Paul Ryan," Trump said in an interview that aired Tuesday morning on ABC's "Good Morning America."

"I think he could be more supportive to the Republican nominee. We're doing well. I think we're going to win the election."

When asked if he thought Ryan wanted Trump to win, the GOP nominee said: "Maybe not."

"Because maybe he wants to run in four years and maybe he doesn't know how to win," Trump said.

"Maybe he just doesn't know how to win."

Trump has been knocking Ryan in recent days since reports surfaced that the Speaker would no longer campaign with or defend Trump.

Ryan's decision came after the release of a 2005 tape in which Trump talks about how he can grope and kiss women without their consent because of his celebrity status. Since its release, multiple women have come forward to accuse the GOP nominee of sexual misconduct.

On Sunday, Trump tweeted that Ryan was "always fighting the Republican nominee" and called for Ryan to focus on the issues facing the country.

“Paul Ryan, a man who doesn't know how to win (including failed run four years ago), must start focusing on the budget, military, vets etc.,” Trump tweeted Sunday.