The White House declined to comment on the Iranian flag flap created by the U.S. Soccer Federation's removal of the Islamic emblem from a photo on the U.S. men's national team's Twitter account.

National Security Council spokesperson John Kirby said the White House would not have comment during a White House press briefing Monday afternoon.

"This isn't the kind of thing that you would -- that the White House would -- comment on," Kirby said at the briefing. "USA soccer is a private entity, and they make their own decisions about those kinds of things, and we wouldn't comment on that. We wish them all the best tomorrow."

Kirby also said he wasn't aware of any conversations or consultations involving anyone from the U.S. government about the U.S. Soccer Federation's decision to alter the flag.

The logo was later added back to the flag in the team's Twitter header. The federation had said it was done to support protesters in the country currently demonstrating against the totalitarian regime and its treatment of women.

-ABC News' Sarah Kolinovsky

U.S. national team coach Gregg Berhalter tried to keep the focus on Tuesday's game at a press conference as he faced questions about why the U.S. team's Twitter account removed the Islamic emblem from Iran's flag in a post Sunday. He also insisted his team had no knowledge of the post.

The U.S. soccer federation said it removed the logo to show support for those protesting in the country against authoritarian rule and its treatment of women.

Berhalter tried to keep the focus on the uniting power of sports and the World Cup, even as Iran called for the U.S. to be kicked out of the World Cup for altering its flag.

"Sport is something that should bring people together, bring countries together," Berhalter said. "When you look at the Olympics, to see all those countries competing at the same time, is a wonderful event. The World Cup is very similar, where people come from all around the world. Fans come from all around the world, and you get to compete on the field, as brothers, so sport does have the ability to do that."

U.S. captain Tyler Adams was criticized by an Iranian reporter for mispronouncing "Iran," which he apologized for, and he was questioned about discrimination in the U.S., saying it is everywhere but there has been progress. But he also deflected attention back to the game.

"Listen, we support Iran's people and Iran's team. But that being said, you know, we're laser focused on this match as they are as well," Adams, 23, told reporters. "We know how important this is for our progress of our team and what we want to do to prove to our country, you know, how hard we've been working. And we know they want to do exactly the same."

The U.S. must defeat Iran Tuesday to advance to the knockout stage of the tournament.

-ABC News' Karyn Rhodus

Portugal dispatched Uruguay on Monday, taking its second win of the tournament and guaranteeing superstar Cristiano Ronaldo will see the knockout stage in what is almost certainly the 37-year-old's last World Cup.

Portugal won 2-0 behind two goals from Bruno Fernandes. The Manchester United star -- briefly Ronaldo's teammate before Man U dismissed the star -- scored the match's first goal in the 54th minute and then added the clincher in the 93rd minute on a penalty kick.

Portugal will play South Korea on Friday, but will likely rest some players to get them ready for the knockout stage.

In the Group G competition Monday, Brazil beat Switzerland 1-0 with a late-game goal by Casemiro.

With that, Brazil has won both its matches so far in the tournament and sit atop the group.

Belgium entered the World Cup with the No. 2 ranking in the world with its so-called "Golden Generation" looking at one last chance to win the tournament. Now, the team is fighting just to advance to the knockout stage.

All eyes will be on Romalu Lukaku, the star forward for Belgium who has been recovering from a hamstring injury, to see if he can play and play well. He came on as a substitute in the squad's second game for his first action of the tournament. He'll start Thursday's game on the bench too, but figures to be an important substitute.

Belgium, currently third in Group F, faces Croatia, which stands atop the group. A win for Croatia puts them in the second round and officially eliminates Belgium. A win for Belgium would also put them through. A draw and it gets more complicated, with Morocco also in contention.

Morocco is facing off with Canada, which is unfortunately already eliminated from advancing to the knockout stage in its first World Cup appearance since 1986. At 0-2, the country would still like to get its first World Cup victory ever. Morocco would clinch a spot in the second round with a win. If both matches end in a draw, then Croatia and Morocco would go through to the knockout stage.

The second slate of games Thursday features longtime soccer power Germany fighting to stay alive. The country sits last in Group E with just 1 point. They'll need to beat heavy underdog Costa Rica just to have a chance to advance. If Germany wins and Spain beats Japan, Germany would get through.

Spain or Japan would advance with a win as they play each other. Spain would also advance with a draw, but Japan would only advance with a draw if Germany loses or ties or Germany wins and Japan has the better goal differential.

Here's the schedule for Thursday: