Rep. Ileana Ros-Lehtinen of Florida also welcomed the 24-year-old Siverio to the U.S. in a post on her Twitter account on Wednesday. A message was left by The Associated Press seeking comment from the Cuban-American Republican.
Siverio was not listed when Team USA released an updated roster for Cuba on Wednesday. Team USA CEO Paul Seiler told the AP that, from Cuba's perspective, Siverio is no longer a member of their delegation.
Seiler and Antonio Becali, the head of the Cuban delegation, declined further comment.
The Cubans are in Iowa to play a team of American college stars in the opener of a five-game set spanning three cities. The set starts Thursday night in Des Moines at the home of the Triple-A Iowa Cubs, marking the first extended series between the two countries in American ballparks since 1996.
Siverio is the latest in a long line of Cuban players who defected to the U.S. Now he hopes to follow in the footsteps of a group of major leaguers who are playing prominent roles for contending teams.
Yoenis Cespedes won the Home Run Derby on Monday night during the All-Star festivities at Citi Field in New York. The 27-year-old outfielder is in his second season with Oakland, which leads the AL West by two games over Texas.
Cincinnati Reds closer Aroldis Chapman pitched a scoreless inning in the National League's 3-0 loss to the American League on Tuesday night. Chapman, one of 18 Cubans on major league rosters at the start of the season, has 21 saves and a 2.79 ERA in 42 games.
Of course, there's also Yasiel Puig, who is off to a sensational start with the Los Angeles Dodgers. The 22-year-old center fielder is batting .391 with eight homers and 19 RBIs in 38 games.
Siverio's defection overshadows what American and Cuban officials are hoping will be a celebration of a decades-old rivalry brought back to life.
The countries played each other in international friendlies from the late 70s until the mid-90s. Cuba also has played World Baseball Classic games in the U.S. and faced the Baltimore Orioles in Camden Yards in a memorable exhibition in 1999.
The matchup between Cuba's national team and American college players resumed last year in Havana, with the Cubans taking three of the five games.
The teams will play a pair of games in Omaha on July 19-20 before one game each in Cary and Durham, N.C.
"It was just a great opportunity to re-ignite what both ourselves and the Cuban federation believed is the two best baseball playing countries going at it," Seiler said at a press conference Wednesday, hours before news broke of Siverio's defection. "We view Cuba as the international benchmark for competition, and we believe they look at us the same way."
Bees' Navarro hitless in Triple-A All-Star Game
Salt Lake Bees infielder Efren Navarro went 0 for 2 during Wednesday's Triple-A All-Star Game in Reno, Nev. Navarro entered the game in the fifth inning as a pinch hitter for the Pacific Coast League and grounded out to third. He remained in the game as a first baseman. In the bottom of the eighth, he grounded out to second. The International League defeated the PCL 4-3.