The Republicans do not appear to be supporting Trump's "suggestion" that election should be postponed:
https://www.bbc.co.uk/news/world-us-canada-53599363
The worrying part of the report is below.
'In June, New York allowed voters to vote by post in the Democratic primary poll for the party's presidential candidate. But there have been long delays in counting the ballots and the results are still unknown.
US media report that there are also concerns that many ballots will not be counted because they were not filled in correctly or do not have postmarks on them that show they were sent before voting officially ended.
According to the Washington Post, US Postal Service workers say backlogs may delay delivery of ballots in time for November's election because of cost-cutting measures under the Trump administration.'