Yeah but they just accidently on purpose picked up Trump's voice on a wiretap, you know (wink wink)
How many times do I have to post this?

Manafort was the subject of the FISA order, not Trump. If the conversation did not cover the reason for the FISA approval, the conversation would be erased. It's the law.
Below is the law.
"Information acquired from an electronic surveillance conducted pursuant to this subchapter concerning any United States person may be used and disclosed by Federal officers and employees without the consent of the United States person only in accordance with the minimization procedures required by this subchapter. No otherwise privileged communication obtained in accordance with, or in violation of, the provisions of this subchapter shall lose its privileged character. No information acquired from an electronic surveillance pursuant to this subchapter may be used or disclosed by Federal officers or employees except for lawful purposes."
50 U.S. Code § 1806 - Use of information