Shaikh Muhammed ibn Haadee (may Allaah preserve him) was asked whether the ruling of at-Tirmidhee when he makes a hadeeth “Saheeh” can be relied up. He answered: At-Tirmidhee’s rulings of Saheeh upon a hadeeth are stronger than his Hasan rulings. Also, he has been described as somewhat lenient. So when looking at Imaam at-Tirmidhee one should look to see who agrees with him from the well-known and bonafide scholars of hadeeth. [Source: https://twitter.com/AbuKhadeejahSP]