Uber is asking its investors for more money to expand in China

Uber is nearing 1 million rides a day in China now and looking to raise new funds to expand there, according an email leaked to the Financial Times.

The email said, "given the enormity of the opportunity," its formally launching a fundraising round for UberChina on June 22. Uber is inviting its previous investors to participate in it.

Uber has not responded to request for comment.

"Simply stated, China is the #1 priority for Uber's global team," Kalanick said in the email. Guangzhou, Hangzhou and Chengdu are now the three largest cities on a trips basis, overtaking New York, according to the note.

The company has previously raised more than $5 billion in several funding rounds, including a $600 million investment from Chinese company Baidu.