The program supports short trips of PhD students from the U.S. to Israel and from Israel to the U.S., which will advance their research. The program does not support participation/presentation in a conference or workshop.
Previously failed applicants may possibly resubmit, but only after receiving approval from the BSF office, which will evaluate their chances based on criteria such as progress they have made, improved invitation letter, improved visit plan, etc.
Description of the program and submission forms can be found here. In the most recent round the success rate was 29%.
The deadline for submissions is May 7th, 2020.