Several GOP lawmakers were more “shaken” by the testimony from State Department aide David Holmes than they publicly let on, according to one top congressional GOP source.

Behind closed doors, many expressed frustration that Ambassador to the European Union Gordon Sondland would place a call to President Trump in a public restaurant, and are concerned that Holmes’ testimony was the most convincing argument for Trump’s direct involvement in the campaign to pressure Ukraine.

Holmes’ testimony is also making some GOP members worry about how far Sondland will go in his public testimony Wednesday.

Two senior Republican sources said that some House Republicans are also worried about how Sondland will handle himself at Wednesday’s hearing. The sources pointed out that Sondland is not an accomplished diplomat and one source added he believes Sondland was unprepared and ill-fitted for the job as US ambassador to the EU.

According to multiple State Department and former State Department officials, he was not well regarded by the US diplomatic community.

House Republicans are also increasingly worried about the political fallout from the hearings overall and the impact of multiple witnesses who are career professionals.

They are especially concerned about the reaction from independent voters and suburban women voters who are watching Trump attack witnesses both on Twitter and on television.