A memo detailing the transcript of the telephone call between Trump and Zelensky was released by the White House last week.
One text message, written by William D. Taylor, a top U.S. diplomat in Ukraine, on Aug. 9 raised concerns about withholding military aid until Zelensky launched an investigation, the Post reported.
“Are we now saying that security assistance and WH meeting are conditioned on investigations?” Taylor texted to Gordon D. Sondland, the U.S. ambassador to the European Union.
Another text by Taylor a month later raised more concerns, the Times reported.
“As I said on the phone, I think it’s crazy to withhold security assistance for help with a political campaign,” Taylor texted Sept. 9 to Volker and Sondland, the U.S. ambassador to the European Union.
"The president has been crystal clear no quid pro quo's of any kind," Sondland texted back, according to the Post. "The president is trying to evaluate whether Ukraine is truly going to adopt the transparency and reforms that president zelensky promised during his campaign I suggest we stop the back and forth by text."
The text messages came to light after a nine-hour, closed-door session between congressional investigators and Volker, the Times reported.
Trump has said he wanted Zelensky to investigate Biden and his son, Hunter Biden, the newspaper reported.