Apple and Google's $20 billion deal, which sees Google serve as the default search engine on the iPhone, is under scrutiny. As we reported this morning, the United States DOJ is continuing its case against Google's dominance in the search industry - and that lucrative Apple agreement is a focal point.

In a new court filing this week spotted by Reuters, Eddy Cue, Apple's Senior Vice President of Services, outlined why Apple itself would never develop its own search engine.

Cue explains that the court believes the proposed remedies in the Google case would lead Apple to "develop its own search engine or enter the Search Text Ad market" and compete with Google's dominance. Cue, however, says "that assumption is wrong."

Here are Cue's reasons as to why Apple will never make a search engine:

Also this week, Reuters reports that Apple "has asked to participate in Google's upcoming U.S. antitrust trial over online search."

"Google can no longer adequately represent Apple's interests: Google must now defend against a broad effort to break up its business units," Apple said in a filing.