Published July 21. 2021 12:05AM By Eugene Scott, Elise Viebeck and Felicia Sonmez, The Washington Post WASHINGTON - The White House projected calm even as it confirmed a breakthrough infection on its own staff Tuesday, sticking to its message that vaccines and safety protocols would keep Americans safe from coronavirus as the Delta variant moves through the country. White House press secretary Jen Psaki said Tuesday that a fully vaccinated staffer had tested positive for the coronavirus, shortly after House Speaker Nancy Pelosi's office confirmed one of her staff had tested positive. The Pelosi staffer had contact with Texas lawmakers who are in Washington to prevent passage of a voting bill in their home state. Six members of that delegation have tested positive for the coronavirus in recent days.