In a move to pressure Trump, Clinton will release 2015 tax returns this week

Hillary Clinton will release her 2015 tax returns this week to put pressure on Donald Trump to do so, sources told CNBC.

Clinton's effective tax rate reportedly is around 35 percent, while her charitable donations make up 10 percent.

Democratic vice-presidential candidate Tim Kaine is also expected to release 10 years of tax returns.

CNBC's John Harwood contributed to this report.