Washington — President Trump said Republican Sen. Rand Paul and his family are welcome to attend the annual congressional picnic at the White House, reversing course after Paul said the "incredibly petty" White House rescinded his invitation over his opposition to the GOP-backed budget bill.

The president is scheduled to host members of Congress from both parties and their families Thursday, an annual tradition that takes place on the South Lawn. Paul told reporters on Capitol Hill on Wednesday that the White House had disinvited him.

"I think I'm the first senator in the history of the United States to be uninvited to the White House picnic," the Kentucky senator told reporters. "Every Democrat will be invited, every Republican will be invited, but I will be the only one disallowed to come on the grounds of the White House." 

Paul said he had planned to bring his wife, son, daughter-in-law and 6-month-old grandson to the event, but learned that they were no longer invited when he went to claim their tickets.

"I just find this incredibly petty," Paul said. "The level of immaturity is beyond words." 

"They've decided they want to declare war on my family and exclude us from the White House," he added, saying he was given no explanation. "We're just not welcome." 

Mr. Trump responded on Thursday, that Paul would be invited after all.

"Of course Senator Rand Paul and his beautiful wife and family are invited to the BIG White House Party tonight. He's the toughest vote in the history of the U.S. Senate, but why wouldn't he be?" the president wrote. "Besides, it gives me more time to get his Vote on the Great, Big, Beautiful Bill."

Later Thursday, Paul of his grandson wearing a red Make America Great Again hat and said "Turns out my grandson is actually invited to the Congressional Picnic! He is ready!" 

Mr. Trump told reporters that he's looking forward to seeing Paul, adding that "he's the hardest vote in the history of the U.S. Senate to get." 

"He's always been a friend of mine," Mr. Trump said. "But I don't think he understands how great this bill is." 

Paul has been critical of Republicans' sweeping policy bill aimed at advancing Mr. Trump's second-term agenda because it would raise the debt ceiling by trillions of dollars. He has said he could be convinced to support the package if the debt ceiling provision is removed and voted on separately. 

The senator on Wednesday accused the White House of running a "paid influencer campaign" against him on social media in recent weeks as he's expressed his dissatisfaction with the legislation and said Republicans will be to blame for the debt levels. 

"I'm arguing from a true belief and worry that our country is mired in debt and getting worse, and they choose to react by uninviting my grandson to the picnic," he said. "It really makes me lose a lot of respect I once had for Donald Trump." 

Paul said the behavior shows "they don't care about my vote at all." 

"They're afraid of what I'm saying, so they think they're going to punish me. I can't go to the picnic. As if somehow that's going to make me more conciliatory," he said. "Petty vindictiveness like this … it makes you wonder about the quality of people you're dealing with." 

Several other Republican lawmakers have also laid out their red lines for the legislation. It's unclear if any other members of Congress who were planning to attend the picnic had their invitations rescinded.