Nearly 10 percent of primary voters who are supporting Donald Trump are crossovers from President Barack Obama in 2012, according to a new study.

The RAND Corporation Preidential Election Panel survey shows that in “December 2015, 8.6% of all Trump supporters (among those who planned to vote for him in a Republican primary/caucus) said they voted for Obama in 2012,” said sociologist Michael Pollard.

“In March 2016, 7.9% of all Trump supporters (among those who planned to vote for him in a Republican primary/caucus) said they voted for Obama in 2012,” Pollard added.

Still, “It’s also possible that some of the former Obama [pro-Trump] voters will migrate back to the Democratic candidate as the election draws closer,” Pollard explained.

Pollard says the latest data is from March and the next wave of crossover information will come in July, after the Republican National Convention and the Democratic National Convention, where the nominees from both parties are formally announced.

Trump has collected some of his rivals’ supporters as well, according to Pollard. Rand’s March data also showed how Trump has won support from other GOP candidates since December. By March, Trump’s supporters comprised: