Benchmark Capital, the investor and board member that filed a lawsuit against former Uber CEO Travis Kalanick last week, has published an open letter to employees explaining itself.

In it, the VC warns that Kalanick appears to have "undermined" the search for a new CEO and that it fears he is plotting his return to power at the ride-hailing company.

The lawsuit centers around three board seat that Kalanick controls, one filled by himself and the other two, vacant.

Benchmark alleges that when Kalanick resigned in June, he agreed to turn over control of those vacant seats so the board could find independent directors but that he has dragged its feet on signing thepaperwork.

The letter says that Benchmark warned Kalanick a month ago that if he didn't sign the paperwork, it would sue.

"We believed then [in June when asking for his resignation], as we believe now, that failing to act would have meant endorsing behavior that was utterly unacceptable in any company, let alone a company of Uber’s size and importance.

... the better question is why we didn’t act sooner ... "

Benchmark is referring the allegations of sexual harassment and the many other charges leveled at the company. It also pointed out that Uber has been operating without a CFO for over two years.

In the letter to Uber employees, Benchmark insisted that this lawsuit isn't about a typical battle of egos in a boardroom and apologized to the company's employees:

"It’s easy to reduce this situation to a battle of personalities. But this isn’t about Benchmark versus Travis. It’s about ensuring that Uber can reach its full potential as a company. And that will only happen if we get rid of the roadblocks and distractions that have plagued Uber, and its board, for far too long. We need to focus on the work ahead — on building a company that everyone is proud to be associated with: employees, riders, drivers, and the cities you serve. You deserve that. You have always deserved that. We are sorry that it has taken us so long to do the right thing."

"Like many shareholders, I am disappointed and baffled by Benchmark's hostile actions, which clearly are not in the best interests of Uber and its employees on whose behalf they claim to be acting. Since 2009, building Uber into a great company has been my passion and obsession. I continue to work tirelessly with the board to identify and hire the best CEO to guide Uber into its next phase of growth and ensure its continued success."