Lawmakers on Tuesday overwhelmingly voted in favor of a motion supporting NATO, as President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE continues to criticize the alliance ahead of his summit in Europe.

The nonbinding motion, which came as the Senate voted to reconcile its version of the annual defense policy bill with that of the House, expresses the Senate’s support for NATO and calls on negotiators to reaffirm the U.S. commitment to it.

The 97-2 vote in the Senate comes as Trump heads to Brussels. He will also travel to the United Kingdom and meet one-on-one with Russian President Vladimir Putin in Helsinki during his trip.

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GOP Sens. Rand Paul Randal (Rand) Howard PaulRand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts Health officials tell public to trust in science MORE (Ky.) and Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (Utah) voted against the measure.

Democratic Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (R.I.) proposed the measure, calling the U.S. support for NATO "ironclad."

Trump has long been critical of NATO members for failing to meet their defense spending commitments, and has ramped up the criticism in the days ahead of the summit.

The president suggested in a tweet on his way to Brussels that other NATO members should reimburse the U.S. for what he has called the nation’s “unfair” contributions to the alliance.

NATO members agreed in 2014 to increase their defense spending to 2 percent of their gross domestic product by 2024. But Trump has incorrectly suggested that this spending is meant to be on NATO as a whole, not on the countries’ individual defense.

The attacks also come as Trump has frustrated key allies like the European Union, Canada and Mexico with steep tariffs on steel and aluminum imports.