"It was not an accident, it was completely intentional, and I have never been so sure of anything in my life", the pop star said in a deposition.
In 2015 Mueller sued Swift, her mother Andrea Swift and her radio promotions director Frank Bell, claiming that the touching allegations are false.
Swift then countersued for assault and battery, and that became part of the same trial.
Mueller says the photo only shows him trying to jump into the frame.
Martinez will allow Bayard de Volo to testify why Swift might have waited to report Mueller's alleged assault, but she will not be allowed to talk about why she believed Mueller might be prone to commit an assault because his masculinity had been threatened due to anxiety with his job.
Opening statements are expected on Tuesday afternoon in a case that could last two weeks.
McFarland also suggested that Mueller may have been a victim of mistaken identity and that Swift might be confusing him with another man who was there.
Mueller was the first witness called to the stand - where he said once again under oath that he did not grope the celeb when he hopped into the controversial photo.
"The contention that Mr Mueller lifted up Ms Swift's skirt and grabbed her bottom, while standing with his girlfriend, in front of Ms Swift's photographer and Ms Swift's highly trained security personnel, during a company-sponsored, VIP, backstage meet-and-greet, is nonsense", wrote his lawyer in court documents.
The singer also attended jury selection on Monday. One said on her questionnaire that she found Ms Swift "petty and dishonest".
In addition to Swift, Mueller named her mother and a member of her team as defendants in the lawsuit.
Ackman seeks board seats, CEO ouster at ADP
Ackman met with Rodriguez on Thursday and asked to postpone the nomination deadline but was told no, two sources told CNBC. Ackman told the company he wants to nominate himself and four other directors to the 10-person board.
United States electric vehicle manufacturer Tesla plans to raise $1.5bn (£1.15bn) to fund production of its new Model 3 auto . That's a far cry from the 5000 run rate promised by Tesla for this year end, let alone the 10000/week target for 2018.
Before getting a spot on " Fox News Specialists ", Bolling was a co-host on the popular evening program, " The Five ". According to the Huffington Post , Bolling was also caught making misogynistic comments on air.
The de facto leader of the Samsung business empire could face up to a dozen years behind bars if prosecutors get their way. Samsung's lawyers do not contest having donated a large sum of money to the entities controlled by Choi.
Al Jazeera reported on its website that it was blocked from attending the news conference where Mr Kara made the announcement. Kara said Al Jazeera should be banned from broadcasting from Israel on grounds of incitement.
In recent weeks, the Taliban have been increasing their attacks on towns and cities across the country. He said one police officer was killed at the scene and another who was wounded died later in hospital.
The Russian foreign ministry has expressed "deep regret" over Brussels' decision to expand the anti-Russian sanction list. The European Council said those sanctioned will be subject to a travel ban and a freeze of assets held in the EU.
The state weather bureau said lunar eclipses are safe to watch and observers don't need to use protective filters for the eyes. The full moon will emerge from the shadow area at 1918 GMT, and then the partial eclipse will end, said the report.
Some conservatives have also criticized him for granting security clearance to Susan Rice, Obama's national security adviser. Another conservative outlet, The Daily Caller, declared that " Everything the President Wants to Do, McMaster Opposes ".
North Korea top of agenda at ASEAN meeting
He argued it is better to have dialogue and utilize a rare opportunity where parties involved in the issue are meeting together. Kang and Kono will hold a separate meeting Monday in the Philippine capital, South Korea's Yonhap News Agency reported.
Markets Calm Sunday Despite US-North Korea Tensions
North Korea has embassies and some businesses in several South-east Asian countries, some of which trade goods with Pyongyang. The urgency of the situation was underlined by President Donald Trump's national security adviser H.R.
China Considering Military Action Against India
New Delhi , however, has not accepted Beijing's contention as it views the status of Sikkim as settled-that is, as part of India. China has put its foot down and demanded that Indian troops be immediately withdrawn to end the military standoff .
Solar eclipse 2017: What to expect in New York City
Those optical devices concentrate the solar rays, will damage your eclipse glasses or viewer, and seriously injure your eyes. He plans on bringing a portable telescope with him that is fitted with a special lens so he can safely view the eclipse.
Mourinho vows to be patient with Man Utd new boy Lindelof
Until the last week of the season, Matic had played in every league game, other than Manchester City away, when he was injured . One swallow doesn't make a summer, but with his cross for Henrikh Mkhitaryan's goal, Darmian is looking like a powerful asset.
Polish man arrested over Milan model abduction
Her captor was described as British-Polish and tried to sell her on the internet for 300,000 Euros (£270,000). While holding her hostage, the man demanded around £45,100 (€50,000) from her if she wished to be freed.
Rahul Gandhi visits flood affected villages in Rajasthan
He was travelling with SPG Commandos and some of whom were reportedly injured in the attack as they were sitting in the back. The Congress leader was accompanied by other Congress leaders Sachin Pilot, Ashok Gehlot and party workers.