It is reported by Bloomberg with reference to two informed sources.
According to one source, Vice President Mike Pence will represent the US delegation in Warsaw.
It is noted that the hurricane should reach the coast of Florida on Tuesday, September 2.
Earlier, Polish media reported that US President Donald Trump is postponing his visit for a day and will not arrive in Poland on Saturday, August 31, as planned, but on Sunday, September 1.
Trump was supposed to visit Poland to attend events marking the 80th anniversary of the outbreak of World War II.
The presidents of Poland, the USA and Germany were to deliver a speech on September 1 in Warsaw.